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Mathematics 14 Online
OpenStudy (anonymous):

Verify the identity cos 4u = (cos^2)2u - (sin^2)2u

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!!

ganeshie8 (ganeshie8):

you figured out how to solve already :)

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