d/dx [f(x) · g(x)] equals:
Af'(x) g'(x)
Bf'(x) + g'(x)
Cf(x) g'(x) + f'(x) g(x)
Df'(x)/g(x)
Answer & Solution
Correct answer: C. f(x) g'(x) + f'(x) g(x)
Product rule (Leibniz rule).
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