If f is a real-valued differentiable function such that f(x)f'(x) < 0 for all real x, then:

f(x) must be an increasing function

f(x) must be a decreasing function

|f(x)| must be an increasing function

|f(x)| must be a decreasing function

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If f is a real-valued differentiable function such that... | Mathematics MCQ #6 | Examora | Examora