$\left(-5n-19\right)\left(n+10\right)$
$\cos^{2}\theta$
$-2x>2$
$\left(8xy+1\right)\:\left(1-8xy\right)$
$\left(x^2+1\right)y''+y'-x^2y$
$-2+3\left(-1\right)$
$m\frac{1}{2}-3$
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