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Derivative

posted by on .

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

  • Derivative - ,

    if f'(x) = 1/x
    f(cos x)' = 1/cosx * -sinx = -tanx

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