Ask Me Help Desk - Use tri identities to simplify

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use tri identities to simplify

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

Notice the difference of two squares in the num. and den.?.

Remember that $x^{2}-y^{2}=(x+y)(x-y)$

Actually this whittles down to something very simple.

Remember the identity: $cos^{2}(x)-sin^{2}(x)=cos(2x)$

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