The following image shows my confusion: I don't have any trouble doing the derivative, but how did they arrive from the second-last line to the last? I know that sin^2(x) + cos^2(x) = 1, but I can't see how to relate that here.
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Originally Posted by scorpion007 The following image shows my confusion: I don't have any trouble doing the derivative, but how did they arrive from the second-last line to the last? I know that sin^2(x) + cos^2(x) = 1, but I can't see how to relate that here. Since you were told that and , we see that:
Ahh! Oops. Of course Thank you.
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