$\lim_{x\to\infty}\left(\frac{3x^4-2x^2+1}{8x^3+2x+3}\right)$
$\frac{dy}{dx}=\left(x+y\right)\frac{1}{-x}$
$2x\left(4x+15\right)$
$\lim_{x\to-2}\left(-3\right)$
$5x^2+4x-1=0$
$3^4+3^{10}$
$\int\frac{2x^3+7x^2+15x+8}{x\left(x+2\right)^2}dx$
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