$mn^2-3mn^2-5mn^2$
$4\cot\left(x\right)+2=2$
$\left(3x^4\right)\left(2x^4\right)$
$-y^2dv+y\sqrt{v}dy$
$\int-\frac{1}{2}e^{-2x}dx$
$y'+y^3=0$
$\frac{6}{7}+y\ge6$
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