$\frac{1}{a+a^2}+\frac{3}{a+a^2}$
$\int\left(\frac{x}{\left(x+6\right)^3}\right)dx$
$\int\csc^2\left(6x+2\right)dx$
$\frac{13x+3}{x-3}\ge7-2x$
$\left(3^0\right)^3$
$2x^{-2}-7x^{-1}-15=0$
$\cot\left(\frac{\pi}{2}-x\:\right)\cot\left(x\right)$
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