$\int3x\sqrt{1-2x^2}dx$
$\frac{2+\sqrt{-12}}{2}$
$2\left(n+2\right)=4n+1-2n$
$3^5\cdot3^6$
$\int\:7x^3\cos3x\:dx$
$19\left(-15\right)$
$\frac{1}{\cos\left(x\right)^2}-1=\tan\left(x\right)^2$
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