$\int x\:\cos\left(ax\right)\:dx$
$\left(15v+10+5v^2\right)xdx+x^2\left(5v+7\right)dv=0$
$\frac{-5a^2x^4}{-3x^2}$
$\frac{d^2}{dx^2}\frac{2}{x^3}$
$\infty-2$
$5\:\left(-2\right)-3\left(-1\right)-5.2+7$
$\sqrt{5}+\sqrt{5}$
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