$\left(5mn\:-\:8a\right)^3$
$\frac{x^3+x-1}{x+2}$
$100-3y+4y-3y^2$
$\sqrt{5}\cdot\sqrt[4]{25}^2$
$-2a-\left(a-3\right)+\left(-a-2\right)+\left(a+5\right)$
$\left(2x^2-4\right)\left(2x^2+4\right)$
$\frac{\cos\left(-x\right)}{1-sin\left(-x\right)}=secx-tanx$
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