$\frac{\left(\:sin^2x+tan^2x\right)}{sin^2x}$
$\int\left(\frac{5e^{-3y}}{e^{-3y}-6}\right)dy$
$\frac{2}{3}m-\frac{1}{3}m+n+\frac{1}{2}n\:$
$15+10+18$
$18\left(\frac{2}{3}\right)$
$\left(7x_-8\right)+\left(7x\:+\:4\right)\:$
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