$\frac{a}{20}=11$
$\frac{d^2}{dx^2}\left(x\cdot\cos\left(x\right)\right)$
$\frac{dy}{dx}=5-25x^2$
$18x^2+7x^2$
$1+3x-7x$
$-250:\left(-5\right)$
$\frac{8}{x^{2-2x-15}}$
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