$\lim_{x\to\infty}\frac{2^x-2^{-x}}{2^x-2^{-x}}$
$\:4-3+2-8-2.10$
$\frac{dy}{dx}=\frac{x}{a}+\frac{a}{x}$
$\lim_{x\to3}10\:-\:2x$
$\lim_{x\to\infty}\left(\frac{ln\left(x^2\right)}{lnx}\right)$
$\frac{dy}{dx}=\frac{1}{2}\left(1+x\right)y^2$
$\int\frac{3x-1}{x^2+4x-5}dx$
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