$\lim\:_{x\to\:\frac{\pi\:}{4}}\cot\left(x\right)$
$20^3+60x^2-80$
$\left(-4ut+2ab\right)^2$
$\int\frac{x^2+3}{x^3+9x+1}dx$
$\frac{12x^5}{4x^3}$
$1.495\cdot10^8$
$\int-6t\:sec^2\left(t^2\right)tan^4\left(t^2\right)dt$
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