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OpenStudy (anonymous):
\[f=\cos({1\over2}\pi-5x)\]\[f'=[-\sin({1\over2}\pi-5x)]\times-5\]\[f'=5\sin({1\over2}\pi-5x)\]\[f'=5\cos5x\] Can someone please explain the last two steps?
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OpenStudy (dumbcow):
difference formula sin(a -b) = sina cosb - sinb cosa
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