# How can I prove that $f$ and $g$ are measurable functions [closed]

Let we have the following functions :

$f(x)=(\sin x)^4$ and $g(x)=(\cos x)^4$

How can I prove that $f$ and $g$ are measurable functions

## closed as off-topic by user223391, user147263, Jonas Meyer, hardmath, Mike PierceJul 5 '15 at 1:00

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