$7a+2b+a+3b$
$\int x^3\left(4+x^2\right)dx$
$x-2\:\cdot3x$
$\frac{1}{\cos\left(x\right)}-cos\left(x\right)=sin\left(x\right)\tan\left(x\right)$
$\int\:\left(3x+1\right)\left(x+2\right)^2dx$
$\frac{n^42n^2-48}{n^2+8}$
$\lim_{x\to2\pi}\left(\cot\left(x\right)\right)$
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