$\lim_{x\to\infty}\left(-x^te^{-x}\right)$
$-x+7,2x+2x-3,5+4$
$\frac{dy}{dx}-\frac{3y}{x}=x$
$9\cdot\left(15-8\right)+6\cdot\left(-9\right):3$
$4x^4-9x^2-6x-1$
$\frac{dy}{dx}=\frac{1}{8}.\sqrt{x}$
$\frac{arctan\left(\sqrt{5\left(\infty\right)}\right)}{\sqrt{5}}-\frac{arctan\left(\sqrt{5\left(1\right)}\right)}{\sqrt{5}}$
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