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OCW Scholar - Single Variable Calculus 12 Online
OpenStudy (anonymous):

f(x) =2cos(2x-7). Find f'(x).

OpenStudy (chrisfso):

how about (substitution, chain rule)\[=2\cos(u)u', u=2x-7\] =-2sin(u)2 =-4sin(u) =-4sin(2x-7)

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