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If f is a real-valued differentiable fun...

If f is a real-valued differentiable function such that f(x) `f'(x)lt0` 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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The correct Answer is:
D
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