$\frac{d}{dx}cos^2y\:+\:2sinx$
$\left(x^{2m}-y^{2n}\right)\left(x^{2m}+y^{2n}\right)$
$512x^3-125y^3$
$\left(5a^3-7a\right)$
$\frac{x}{13}=7$
$\frac{dz}{dt}=5t\cdot e^{7z}$
$x+12+\left(-x\right)-7$
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