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27. Let f : R → R be a differentiable function such that f(x)f'(x) < 0 for all x ∈ R. Then
A. f(x) is an increasing function B. |f(x)| is an increasing function C. f(x) is a
decreasing function D. |f(x)| is a decreasing function
.
.
.
answr is d . how ?

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