$\left(-15\right)\left(-20\right)\left(30\right)$
$2x+10-12$
$30x^3-45x^2$
$\frac{1}{\sin}-\frac{\sin}{1}$
$25x-40x+16$
$\int\frac{\left(x+2\right)}{\left(3+2x-x^2\right)}dx$
$\int\:\:\:-2x^7e^{-x^4}\:dx$
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