Multiple choice general knowledge math & puzzles The derivative of f(x) . g(x) is equal to f '(x) g(x) + f(x).g '(x). True False Reveal answer Fill a bubble to check yourself A Correct answer Explanation This is the standard Product Rule in calculus. It states that the derivative of a product of two functions is the derivative of the first times the second, plus the first times the derivative of the second. The statement is mathematically true.