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anonymous
 one year ago
PLEASE HELP ME!!! I JUST NEED TO KNOW HOW TO DO THIS!!
Verify the identity.
cos(4u)=cos^2(2u)  sin^2(2u)
anonymous
 one year ago
PLEASE HELP ME!!! I JUST NEED TO KNOW HOW TO DO THIS!! Verify the identity. cos(4u)=cos^2(2u)  sin^2(2u)

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I made this trig sheet. http://learnix.net/wordpress/wpcontent/uploads/TrigCheatSheet1.4.pdf Can you see an identity on it that might fit this situation?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I'm really not sure how this is done. This is why I am asking how it can be done

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0check out on my sheet where it says Angle Sum and Difference Do you see the cosine one, which is second from top?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes? Could you please tell me how to do it?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0like what steps would I take?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So what do we need to do to make cos(4u) to look like cos(x+y) where x and y are anything. Sorry for the delayed response too.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i don't know, please just explain to me

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay, so we can rewrite cos(4u) as cos(2u+2u) right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0According to my cheat sheet you follow the right hand side of the equation now. Can you do that?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0no, please just show me how to do it. I'm a visual learning

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@Hero @geny55 @deana99 @omarbirjas @johnweldon1993 @Awolflover1 @Quan99 @EclipsedStar @razor99 @flvsucks @Nnesha @clamin @xo.minnie.xox @zepdrix @Pocarii @pixy @highjumpcollect @water_wings @badmood @BellaWolfe @Yolo4mecuite @yisrael012332 @toxicsugar22 @ozhobbits @graysongraddylol

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1\(cos (4u) = cos (2u+2u)\) ok?

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1cos (a+b) = cos acosb  sina sinb now, apply to your problem with a = 2u and b = 2u also you have : \(cos (4u) = cos (2u+2u) = cos (2u)cos (2u)  sin(2u) sin(2u) = cos^2 (2u) sin^2 (2u)\) dat sit.
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