$cos^2a+\left(cot\:a\:\cdot\:cos\:a\right)^2$
$13-2\left|11-2\left(5-2\right)\right|$
$\int x^2\left(x^3+9\right)^3dx$
$\left(u+5\right)^2$
$14-1-3$
$\lim_{x\to-\infty}8x^2e^x$
$\int\:\left(\frac{2}{\sqrt{x^3}}-\frac{5}{\sqrt[3]{x^2}}\right)dx$
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