# Identify this

Algebra Level 5

Given that $f$ is a real valued differentiable function such that $\large{f(x)f^{\prime}(x)<0}$ $\forall~real~x$. Then it follows that

Details

$abs(f(x))=|f(x)|$

$f^{\prime}(x)=\frac{d }{dx}f(x)$

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