MathematicsEasy63×since 2002Q3698Let ƒ and g be differentiable functions on R such that fog is the identity function. If for some a, b ∈\in∈ R, g'(a) = 5 and g(a) = b, then ƒ'(b) is equal to :A1B5C25{2 \over 5}52D15{1 \over 5}51Check answerSkip