$\frac{dx}{dt}=x+3y-2t^2$
$\left(4\:-\:\sqrt{x}\right)\cdot\left(4+\:\sqrt{x}\right)$
$\lim_{x\to infinity}\left(\frac{x-2}{\sqrt{x^2+4}}\right)$
$3a^3-12a$
$25+\left(7-5\right)-\left(2-12\right)$
$\int\:\:cot\frac{1}{2}x\:dx$
$2-5+4-3-1+9$
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