$\int-\cos^2x\sin x\:dx$
$\left(5x^3+3x^2-4y\right)^2$
$60^2-61^2$
$\left(-5x-8\right)\left(-5x+8\right)$
$\left(x+17\right)\left(x+9\right)$
$-9a^2-12ab-4b^2$
$\int\:\frac{u^2+1}{2u+u^3}du$
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