Graphs of Sine and Cosine (3 of 3)

[zakmatew]

In the second problem: y = 5 cos (4x + pi), why the phase shift is negative pi/4? How did it become negative? Can you please explain?

[TheColosseum09]

Great tutorials. Tell me why I could comprehend this in just 3 videos while struggling to comprehend in class? This method is so much more powerful than the traditional ways.

[anak071]

wow thank you so much

[nynirere]

Seriously, I thank you so very much!!! My IB math teacher sucks at teaching =_= and when I found your video... I UNDERSTOOD IT SO PERFECTLY!!! I've actually never been this happy for math, but thanks to you it happened!!!! THANK YOU AGAIN!! I REALLY APPRECIATE IT!!

[wachingvids]

This is what my bs professors fails to teach... Thank you so much now I can solve this problem with out any doubt!

[chapinero017]

i believe the phase shift is -c/b

[coldfirevideo]

To check to make sure your graphing is correct would you plug in your x-values and solve? Thank you so much by the way I was freaking out until I found your video.

[harriskriz]

in the LEP and REP the answers would be x=pi/4 and x=3pi/4... you didn't include the negative sign when you substituted it in...

[harriskriz]

isn't the phase shift  -c/b? that is what i learned at least

[tarunkhandelwaldel]

thank u

[KnuckleoticxMark18]

is the phase shift pi over 3 or negative pi over 3?? because its negative pi over 3 over 1 equals negative pi over 3....

[ruty143sh]

Thanks! This was a great refresher.

[DaisyLech]

I learned so much more from this video than my book! Thank you! You saved me countless hours of pondering over Mathematic syntax.

[XxStopherLixX]

good job with the explaining it really helped. thanks

[Snakez19]

what if your Phase shift is a constant over pie, because the b is pie?? You didn't mention any of those situations on your videos. The Equation am talking about is this one, y=cos(pieX-3)

[waszel]

@Snakez19 This is not a different situation. The concept is exactly the same as what's in the video, it's just a little messier. The phase shift you have is 3/pi, and the period is 2, so determine the L.E.P. and R.E.P. and divide that interval the same way as the intervals on the video. (If it helps, use decimal approximations.) Then plot the points and connect the dots.

[karencorte]

y ps is positive?

[kelsdo241]

so is this only 1pie? how about 2 pie

[333shikaino4ever333]

excuse me but in your formula in 1:16 the phase shift should be -c over b....nice video and thank you very much:)

[jesusclau1]

Great video. Thank you so much!!!

[alexandrasmilesx]

I thought that 2pi was the period. I don't understand why 7pi/3 is used as the end period. Please explain?

[waszel]

The period is 2pi, but the graph has been shifted right pi/3 units. (Note the "L.E.P." and the "R.E.P." mentioned.)