$\left(x^a-y^b+z^c\:\right)^2$
$-7+11-6+8-14-15-12$
$\lim_{x\to-2}\left(\frac{x^4-a}{x^2-2x-8}\right)$
$\left(2x+y+5\right)\left(2x+y+5\right)\left(2x+y+5\right)$
$-999-1$
$\frac{cos\left(2x\right)}{cosx}-\frac{sin2x}{sinx}=-secx$
$\:\frac{dy}{dx}+\frac{9}{40}y=-\frac{81}{32}$
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