$215\cdot3$
$m^2-13m-30$
$\left(x^{a+1}\right)\left(-x^{a+2}\right)$
$-4v-6v+7v$
$\int_0^1a^{3x}dx$
$\frac{dy}{dx}=\frac{-3y}{3x-7y}$
$8cos^2x=4-4cos2x$
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