SOLUTION: Prove the identity: [cos^4(x)-sin^4(x)]/[cos(x)+sin(x)] = cos(x)-sin(x)

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Question 889588: Prove the identity:
[cos^4(x)-sin^4(x)]/[cos(x)+sin(x)] = cos(x)-sin(x)
Answer by Edwin McCravy(20056) About Me  (Show Source):