$m^2n+mn^2-2m^2n$
$\int\tan\left(\pi-\frac{3y}{2}\right)^4dy$
$\cos\left(u\right)\left(1+\:\tan\left(u\right)^2\right)$
$\lim_{x\to0}\left(\frac{\sqrt{x-6}}{\sqrt[6]{x+7}}\right)$
$2x^2-16\ge0$
$2n+4$
$\sqrt{\frac{-7+c}{-3}}=1$
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