$\int\left(x-1\right)\cdot e^{-x}dx$
$\frac{dy}{dx}=\frac{-\left(2y+1\right)}{3y^2+2x}$
$\:7x\:+\:4\:per\:a\:x\:=\:-1$
$m^4+8m^2+16$
$5a^5-3a^2+a^4+4a^2$
$\int_b^a\frac{x}{x-3}dx$
$x^2-11x+-21$
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