Trigonometry: Identities

[2011ch1ck]

shit is hard

[tamilsouljahz25]

THANK YOU!!!!

[KaylyCupcake]

I have my Pre- cal exam in less than a week and the only thing I have trouble with is this !

You really helped me :)

[nayramn]

you know... you are one of the best teachers I've ever seen... you see? I treated you as my real teacher because I am always watching majority of your discussions not only trigonometry but also the other branches of mathematics.. thank you so much

[CODMOD360]

We are learning dis shiz in Pre Cal

and like what ur doing is easy and ur good at teaching it the problem is it just gets a lot harder and longer (thus what she said) but seriously I need help

[TheDrewcula]

MAGIC!

[freshlikewindex]

what about when you got to do double angels, addition and subtraction formulas

[kitkitdgenerate]

@freshlikewindex what angels?

[LassidyWemps]

..great but they get harder...soo?

[bennihana123]

You are the maths master

[theJeeper116]

ds;goasdg[oqnas[ocib'PiHJ'fgli­jfdvg;WEJGN'AOSCiBqia/l..,m sorry i had to pick up my brain pieces off the keyboard

[rawwtheman]

damn wizards and their fancy arithmatiks

[coldfirevideo]

All Hail the math wizard =D

[Gerard300349024]

lost me on #3

[MartinezFreddie]

math

[SuperEJ93]

i also have a test on monday= i was freakn out but after this........ THANK YOU!!!

[MissBoooie]

Thank god for this channel omg I have a test on Monday

[bilguunOO7]

what year/grade do america, english do this type of trigonometry at? 

[100freeswimmer]

@bilguunOO7 im doing this my junior year, 3rd year in high school and some kids can do it there 2nd year

[i94Rules]

@bilguunOO7 Depends i took it last year junior year in high school but i know one of my friends who is really smart and is taking it now as a sophomore.

[fvresonanator]

@bilguunOO7 in England, we are doing this in a-levels, year 12. sixteen to seventeen yrs old.

[amshunnie]

Oh my goodness, you make it look so easy. And you reaaaaally helped me with this. I have a test Monday, and I think I'm getting this, Hallelujah! :D

[hellokocchi]

God bless you. Wanna do my Pre cal homework for me?

[Caboose7699]

Thanks you've really helped me understand this.

[AbleInfinitus]

Thank you very much, good sir! It helped me grasp some sort of an understanding, I'll review notes and hopefully memorize the content you've outlined.

[TheRealNationalist]

Best math teacher i've witnessed.

[owned2hell]

Thanks for the video! I have a teacher that can't teach and I really appreciated your video thanks again!

[AllThatRemainsFan100]

Why the hell should I pay attention in class if I can just use youtube as a guide to all of my math and chemistry homework. Honestly, my teacher complicates this, but I really find it easy now that I've watched your video.

[aviationMY]

Hi Sir, how to simplify this as much as possible: 1-cot theta / tan theta -1

Thank you.

[deavl10]

[tan(x-y)+tany]/[1-tan(x-y)tan­y]=tanx



lol anyone?

[idrinkbubblegum123]

hold shit. youre the best

[cleonardo16]

and look what I've got here.

[shadowkunai12]

you just taught me in 4 minutes what my teacher took 2 days to teach me.

[lexdickable]

please be my math teacher

[JLConawayII]

Wait, I'm confused....does this actually prove that Jesus rode on dinosaurs?

[Brianpeppers15]

this helps me for math 112

thank you much!!

[polengsantiago]

@perther3

if they jumped ahead in their lessons whats the point of watching this and disliking it?

maybe you're one them stupid and saying " Oh... i already know this im advanced... -dislike-"

[polengsantiago]

no ..

13 people are too stupid to understand this video... thats why they dislike it obviously

[ilyxb00]

I hate when your teacher isn't clear & you have to search shit up on youtube. The fuck is that. Waste my time -__-

[elmmonk]

12 people must be sucky math teachers.

[malineeelike]

I subscribed to your channel. :DDDD 

[tolongforyou]

i love you, i learned this from you in 2 min. while it takes my teacher 90min to teach and i still dont get it!

[nesyamiracle]

I my professor knows you. I think y'all went to college together. excellent videos.

[coolkid359]

I think it's time they change how we learn. Schools have been around since like the 1800's and we should find better ways to educate people. Seems like people don't like schools anymore.

[AZNmanJJ]

@coolkid359 teachers teaching online would probably be more efficient than school. but what about the friends and sexy chicks we see in school??? hm.....

[joepisodesmaniacs]

SOOOO MUCH BETTER THAN CLASS! i can pause an look at my notes and follow step by step rather than being rushed through in class

[reelirishkitty]

You have just saved me from getting a horrible grade on the SAT....

[DaRkLoRd1061]

oh i could already do those questions it's the harder ones i'm struggling with :'(

i've even tried rationalising the denominator and i still can't do it...

[EXPLOSIVEXPLOSION]

@DaRkLoRd1061 yeah and i hate when the book and teachers show only easy examples and give you impossible problems

[plasticspastic201]

when would this be useful? i mean i cant even begin to understand where it would be useful. is it comparing two things?

[alwayson09]

@plasticspastic201 The answer is NEVER.

[plasticspastic201]

@alwayson09 thought so. thanks. mathematicians make a vocation out of messing around with numbers that have no actual purpose. i knew it.

[Sword1479]

@plasticspastic201 It's only useful if you're moving to an apartment in Wonderland...

[Davidnerfz]

Danke... :)

[iSuperSmashBros]

can anyone help me with this: tan(2x) – sin(2x) = 2tan(2x)sin^2(x) ? Thanks :) Any help would be greatly appreciated!

[aloap0517]

i love this man

[alujaluyolo]

at last trigonometry is a bit undrstandabl...far bettr dan my teachr..XD

[MetallicSisters]

Thank you a lot !

[abhilashpshetty]

thank you very much sir . ur video helped me in learning how to approach a trigonometric identities . once again thank you!!!!!

[WhySoPink]

omgggg ~ ur explanations are so much better than my teacher ): ~

[shadowbird8954]

Amazing! hands down the best straight forward explanation! Thank you!

[yusolaifdfer]

thanx

[lonedrifter09]

my teacher never told me that if it can be factored then i should factor it. thanks to you i now know something my classmates don't. i shall refer your videos to them.

[joerush25]

are you a wizard?

[xgoldyxo7]

@joerush25 No, he's a mathematician! :)

[JLchevz]

very good video sir, we love you

[madhugonadig]

IN India ........all this come in 8th GRADE!

[lovestolearn365]

Thanks for taking the time to make these videos. They are very helpful !

[stepony5]

This really helped, thank you sooo much. :D

[suxatguitar1]

These ones are simple. The ones we're doing in grade 12 are so much harder.

[iHsg16]

@suxatguitar1 grade 12 math is pure rape... 45%

[suxatguitar1]

@iHsg16 94% for me ;)

[iHsg16]

@suxatguitar1 yea im gonna pretend you said 49%..

Dont worry 1% more and youll pass bro!! :)

[beansemo]

Damn chuck norris got nothing on this dude. Thank you very much!!!!!!!!

[9fram]

legend

[VTGRLDRESSINBLU]

This dude is good. He actually writes legibly unlike my professors.

[RossRocks07]

It always seem easy when someone else does it. Great vid btw. :)

[henybeny]

OMG I LOVE THIS GUY

[bullettomy7thheart]

Wait...do i actually get it?

[Brittanyphurr]

i understand now:o

[loreeloreena]

omg he is god. thanks a lot!

[Toronto2245]

Thanks ALOT! my teacher is a dumb ass..

[Turkey426224]

I never knew chuck norris had a brother???

[l10895]

thanks sexy! it really helped, i understand it alot more now :)

[083Abhi]

thanks for help

[kidwells11]

thank you... my math teacher is a sweetie but she uses way to many fucking words when explaining this shit

[boratfan1234]

fucking amazing



[imantoy]

this is one of my favorite lessons.. the problem he had shown above is very simple.. hehehe..

[kingjohnjohn]

thanks



[ScaryMonstahh]

Thank you sir

[skanecfc]

Good Afternoon

I am really struggling with some trigonometric identities questions, i have been asked to expand, simplify and prove about 10 of these identities and after trying for 2 weeks, watching math tutorials/videos online and asking advice i still don't know how to even start these identities. Please help me, i have put two of my questions below

Cos(2θ) = 2Cos^2θ - 1

Sin(2θ) = 2Tanθ / (1 + Tan^2θ)

Thank You

[Roywood1]

@skanecfc

1) cos(2θ)= cos(θ+θ)=cos(θ)*cos(θ)-sin(θ)*­sin(θ) (double angle formula)= cos^2(θ)-sin^2(θ)=cos^2(θ)- (1-cos^2(θ))= 2cos^2(θ)-1

2)[2tanθ/(1+tan^2θ)] do the denominator first: 1+tan^2(θ)= 1+ (sin^2(θ)/cos^2(θ))=[(cos^2(θ)­+sin^2(θ))/cos^2(θ)] (just make the 1 and the sin share a common denominator)

=1/cos^2(θ). Now the numerator is going to be 2 sinθ/cosθ. Divide through by 1/cos^2(θ) and you get

2sinθcosθ=sinθcosθ+sinθcosθ=si­n(θ+θ)=sin(2θ) using the double angle formula

[gbiota1]

Mr. Garisson, what happened to Mr. Hat?????

[davidpazg]

thank you very much.

[IsThatLeebie]

if only u could teach me all the time

[KBatUofH]

I just farted really loud

[DmitriOlivas]

Just got mind fucked.

[Rji24]

Thank you so much man!! You're a math god !!! Only if my teacher approached math the same way u do :(

[lazysundazed]

thank you so much for this, i'm extremely grateful

[omfgmedic69]

I hope this helps : /

[247ilovechocolate]

WOW this helped a lot thank you so much!!!!

[omgitznatalia]

Dude you helped me a lot. Thank you so much, you have no idea how greatful I am for this vid. Much love.

ps-you have beautiful handwriting

[cmm2797]

This is a great video! I'm pretty much teaching myself Calculus this semester, so I can use all the help I can get!

[Flytothesky12]

i agree to statements above

[coffeyvideos]

the guy is a friggen genius!

[MisterMotion1]

This seems pretty easy, but been taking remedial classes of basic mathematics throughout my high school career. Fuck you high school :)

[definition99]

they should be in the world record book for being such genius'!

[BorealNeal]

i hate trig

[bubbles202]

GENIUS!

[stevomwa1]

My teacher could learn a lot from you.

[rivchick05]

how is the power 4 changed to squared?

[xxBKxxTKxxGLxxGSxx]

@rivchick05 he separated it..it i think..he was using distributive property..coz once you multiply those exponents..you will also get 4

[xD3REKx]

Haha I hate this stuff. We're learning it in Algebra 2 and it isn't fun. Thanks.

[kixaserolf]

thanks a lot :))

[javyer1314]

:D This makes up for the half hour I missed during this lesson. Thank you... Who ever you are :D

[mm120892]

no lie this dude just saved my math grade... or whatever's left of it

[TheRealBologna]

i freaking love you

[ishowyouapple]

how do you know when to change to an identities???

[ForevurrandAlwayys]

thanks a bunch! I have a quiz on this tomorrow in my pre-cal class.

[ytnate93]

Fuck Calculus!! Can I come back to this easy stuff?!?

[supermario0190]

woah. basically explained some of my doubts in such little time. I hope this helps for tommorow b/c i already have the stuff memorized ^___^

[thebellyboppers]

you make that look so easy

[kulotz5555]

i fucking love you

[princesslovesgod]

Sir, you should replace my Trigonometry teacher in school! XD

[idk510]

If only i knew how to do this, i would actually do good on my pre calc test....

[jimluthra]

very nice video. helped a lot

[shakeitbakeit]

Very helpful!

[startintolovereadin]

thanks!! hopefully your examples in proving trigonomic identities will come out in my quiz later :)

[paintballmasta69]

I always forget about difference of squares :o (Like in number 3).

[sabrinagonzales1234]

We do have a dumb teacher... How I wish you are her!

[Drazarian1021]

unfortunately watching this video won't help you on a test the next day lol trig identities take practice

[Redeemed]

@Drazarian1021 sad but true

[maxim2266]

this is what im looking for. i want to learn how to do some harder ones. every other video just sums u the basics and im left learning nothing. fuck yes, and thank you.

[ashleymentorify]

I looove you

[carolina1bernardina]

i think Im gonna subscribe to you.. I like the way you teach, you just make it seem so easy that Im actually liking trig now :)

[SuperSmilingHeart]

You helped me for my trig test! I love you.

[olgapate94]

you make it look so easy, but then, when the test comes, there is the real problem.

[chadasquatch]

aww yeah math test tomorrow like a boss. Thanks, helped :3

[ImOnMyC0mputer]

Are you a wizard?

[maxim2266]

@ImOnMyC0mputer yes

[wvb93]

how would i verify that cot^2x - 1 / 1 + cot^2x= 1 - 2sin^2x

[aindru]

thanks this helped

[crisensation]

you are the man!!

[BiggySn1p3r]

who decided that (sin x + cos x) squared = 1? I want to revote .

[itstristanyo]

@BiggySn1p3r take it up with Pythagoras!

[PaulSeesStars]

@SuperXero89 It is to make you think. Math is not about following steps. Its to make you think and problem solve.

[sTyreEuREka]

how did you know that cos squared t plus sin squared t is equals to 1

[sobia08]

@sTyreEuREka it is 1 of the 3 pythagorean identities

[rainnyday0125]

@sTyreEuREka pythagorean identities

[ovrebo1]

@sTyreEuREka

It is one of the Pythagorean Id's that =1

[CandyChristine17]

Trig in general can just go stick it.

[BabyImSoCute]

love u man

[lib6606]

Thank you this was very helpful!

[lexinaut]

Nicely presented! Thanks! You didn't go on a tangent on that last one. You went on a cotangent! Identities in trickynometry can be tricky because it's easy to take a wrong turn! You can do all your math CORRECTLY and still wind up in the NUMERICAL BOONDOCKS! Here, you've GOT to notice the difference of two squares and catch the Pythagorean Identity that follows or you can wander off. I'll sine off for now.

[sobia08]

@lexinaut lol

[poojabayana]

i liked this video a lot

thank u sooooooo much

could u plzzzzzzz post few videos on the trignometric identies

thank uuuuuuu soooooooooooooo much sir

[09066414032aizl]

i love his demo

[nikkisacapilo]

THANK YOU SIR !

[jinnny1]

looks like john howard :)

[bevon17]

I always feel that math teachers like to fail students

and I'm not joking... like they get off on making people have a tough time

[saygetitBIG]

great explanation of this because my teacher makes it hard

[longliveafg]

very helpful

[albagui]

You are the best. I want your head including the hair.

[AutopsyReport22]

where are the tangent identities?

[sxsder24]

f me now!!!1

[MISTofDAN]

Another method you could use on problem 1 is divide both sides by cos@. Sorry I dont have a theta sign on my keyboard but that was the best I could use.

[Celestialbeing21]

I think from seeing him do this, I got to remember that like multiplying whole numbers by fractions, you always got to put one under the number. In this case of trigonometry, when multiplying trigonometric identity fractions, you always must put the trigonometric function under the same in order to create a whole.

[Kiranchan93]

thank you for your help im a gr 11 student i was struggling with this :)