DifferentiationHard

Question

If f(x) = logx (ln x), then f′(x) at x = e is equal to

Options

A.1/e
B.e
C.1
D.zero

Solution

f(x) = logx(lnx)
⇒  f(x) =
⇒ f′(x) =
⇒  f′(e) = = 1/e

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