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If 'f' is a real valued differentiable f...

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

A

f(x) must be an increasing function

B

f(x) must be a decreasing function

C

|f(x)| must be an increasing function

D

|f(x)| must be a decreasing function.

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