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OpenStudy (anonymous):
Verify the identity cos 4u = (cos^2)2u - (sin^2)2u
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ganeshie8 (ganeshie8):
hint : cos 2x = cos^2x - sin^2x
ganeshie8 (ganeshie8):
hint2 : take LHS, and rewrite it as cos 2(2u)
OpenStudy (dan815):
use it well, with great tables comes great responsibility
OpenStudy (anonymous):
Thank you sooo much!!
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ganeshie8 (ganeshie8):
you figured out how to solve already :)
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