How can I prove if this is an inner product?

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Given

$\left< f,g \right> =\int _{ 0 }^{ 1 }{ f'(t)g(t)dt } \quad in\quad C\left[ 0,1 \right] $

How can I prove if this is (or not) an inner product on the given vector space?

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Hint Consider a nonzero constant function $f$ and compute $\langle f,f\rangle$.