SOLUTION: Okay, here on out, x will be used to represent theta. I need to rewrite this expression in terms of cos(x), and then simplify it. {{{ cos^4(x)-sin^4(x)+sin^2(x) }}} I tried

Question 752899: Okay, here on out, x will be used to represent theta.
I need to rewrite this expression in terms of cos(x), and then simplify it.

I tried going through the various Pythagorean identities as well as the negative-angle identities, but I'm really lost on how to solve this sort of problem.
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!

which when simplified gives us...

:)
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