Still don't get it : use tri identities to simplify

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▸ ▸ ▸ ▸ » Still don't get it : use tri identities to simplify

dejalisco5 Posts: 7, Reputation: 1

New Member

#1

May 14, 2008, 11:20 AM

still don't get it : use tri identities to simplify

cos^2 x - sin^2 x/ cos^4 x - sin^4 x

galactus Posts: 2,271, Reputation: 282

Ultra Member

#2

May 14, 2008, 12:46 PM

Do as I said before. Difference of two squares.

$\frac{cos^{2}(x)-sin^{2}(x)}{(cos^{2}(x)+sin^{2}(x))(cos^{2}(x)-sin^{2}(x))}$

Now, see it? What does $cos^{2}(x)+sin^{2}(x)$ equal?

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