$\int\left(x-1\right)\cdot e^{-x}dx$
$-3\left(x+4\right)=6\left(-x-1\right)$
$\int\frac{2x}{\sqrt{4x+1}}dx$
$\left(5-3x\right)+\left(2x-8\right)$
$\left(4y+7\right)^2$
$\frac{1}{4}\left(\cos^2\frac{\pi}{12}-\sin^2\frac{\pi}{12}\right)$
$16x^4y^2+56x^3y+49x^2$
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