$\lim_{x\to\infty}\left(\frac{ln\left(x^2+1\right)}{x^3-2}\right)$
$t^2\frac{dx}{dt}=\frac{1}{x}$
$-y^2+y+2$
$9cotx-1=13$
$\left(2x-1\right)\left(5x+5\right)$
$\int\frac{6}{\left(40-x\right)^3}dx$
$4\:\left(1.75y-3.4\right)\:+\:1.25y$
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