$\lim_{x\to\infty}\left(\frac{2^{-x}}{x^2+1}\right)$
$2m\:+\:6m\:+\:10$
$-\left(-1\right)-0$
$\left(9u-2x\right).\left(9u+2x\right)$
$\lim_{x\to0}\left(e^{2x^2-1}x^2\right)$
$\int\left(x-3x^2\right)e^{-x}dx$
$\csc\left(x\right)=-\frac{2\sqrt{3}}{3}$
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