$\left(3x^2+4y\right)^2$
$-18n^2-96n-120$
$15\frac{1}{r-x}-\frac{2}{2+x}$
$\tan^2x+2\sec^2x$
$-7-3-5-2-12-6-9-5$
$0=\left(x^2-1\right)^3$
$\cot\:^2\left(x\right)+\cot\:\left(x\right)=12$
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