Let \( f \) and \( g \) be differentiable function satisf ying \( g...

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Let \( f \) and \( g \) be differentiable function satisf ying \( g^{\prime}(a) \) \( =2, g(a)=b \) and \( f \circ g=I \) (identity function). Then \( f^{\prime}(b) \) is equal to
(a) \( 1 / 2 \)
(b) 2
(c) \( 2 / 3 \)
(d) \( 3 / 4 \)
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