By the chain rule, d/dx of f(g(x)) equals
Af'(x) g'(x)
Bf'(g(x)) g'(x)
Cf(g'(x)) g(x)
Df'(g(x)) + g'(x)
Answer & Solution
Correct answer: B. f'(g(x)) g'(x)
The derivative of the outer function at g(x) is multiplied by the derivative of the inner function.
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