Answer
$3t^2+\dfrac{t}{2}$
Work Step by Step
We have $\int (3t^2+\dfrac{t}{2}) dt=t^3+\dfrac{t^2}{4}+C$
and
$\dfrac{d}{dt}(t^3+\dfrac{t^2}{4}+C)=3t^2+\dfrac{t}{2}$
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