$-7+5-13+8-12-7$
$\frac{dy}{dx}=y\tan\left(x\right)+\frac{2x}{\cos\left(x\right)}$
$2a^2+7a-15$
$-8\:-\:4x\:=\:-24$
$\left(2+m^2\right)^2$
$10-\left(-8-2\right)$
$5\left(6-2\right)-\left(4-2\right)$
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