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posted by Mary on Wednesday, March 20, 2013 at 4:42pm.
with respect to x f(cos x) if f'(x)= 1/x find (f(cos x))' i got tan x sec x this is wrong. please explain. thank you
if f'(x) = 1/x f(cos x)' = 1/cosx * -sinx = -tanx
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