Math - Trigonometry Using Sin, Cos or Tan to Find an Angle

A sample lesson showing how to use Trigonometry to find the size of an angle using Sin Cos and Tan, from the expertmathstutor DVD GCSE Maths Revision system. The system comes with 7 DVD's and lessons covering the entire GCSE syllabus plus a 75 page question book and accompanying 80 page worked solution book so you can see where you've gone wrong or right!

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[kila10225]

Idk what's up woth my calulator I typed in cos-1 then .84 and I get .57...dik what's sup.help

[expertmathstutor]

@kila10225 Your calculator might be in rads check on the top, if there is an R then it is in the wrong setting, you need to to have a D at the top, usually you can change it if you press mode and there will be a selection somewhere for deg.

[Thesugarbaby34]

hey thanks. helped me alot. math class doesnt. maybe my teacher should use youtube videos to teach us math.

[Spacehorse99]

like this video and he automaticly gets $1 from youtube so... lets make him rich ! Oh and $.10 a view.

[thiebvan1]

Hot!

[gramboliciousness]

@expertmathstutor On the 2nd problem...

Do you typicaly round off to the hundredth before doing the inverse COS? I don't remember doing that in class and if you don't, the answer is slightly different. You'll end up with 32.64... rounded to the nearest hundredth.

32.85 is close, but on a test I would be wrong if I do it my way.

Thanks for the post bud, just trying to get smarter!

[giyantube]

This is so amatuerish. You haven't explained how you decided why it was cosine or sine or explained what you are doing on the calculator. You are hesistant as well. This is just a video about YOURSELF...not a tuitorial.

[leotomlinson8]

If it weren't for the accent, I would've given up on this hahahaha

[SuperJustalittlebit]

If you were my maths teacher. Id be too buzy staring at you.......LOL

[childishandmature2]

@Thesugarbaby34 agreed. :)

[0CR9]

@noor37130

It's from 3 and half years ago.

[GotGoodSkill]

exam tomarrow D: hopefully this helps.