$\frac{x}{2}+7\le-12$
$\frac{x+2}{2}$
$-\left(x+10\right)\left(x-15\right)$
$x-4=19$
$\left(n^2\:+\:13\right)\left(\:n^2\:-\:13\right)$
$\int_0^{\frac{\pi}{3}}\left(tan\:x\:sec^{\frac{3}{2\:}}\:x\right)dx$
$\left(6x^2-2x+4\right)+\left(3x^2+4x-1\right)$
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