$\frac{2x^2+3x-5}{x+1}$
$\left(3a\:-\:2y\right)^4$
$3x^2+33x+72=0$
$\lim_{x\to\infty}\left(\frac{\ln\left(x-1\right)-x}{\tan\left(\frac{\pi}{2x}\right)}\right)$
$3x-3y+6x+4y+2x$
$\int\left(\frac{\cos^2\left(x\right)+3}{\sin^2\left(x\right)}\right)dx$
$\frac { x + 2 } { x ^ { 2 } + 4 x }$
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