$cot\left(-x\right)+tan\left(-x\right)$
$\left(5\right)\left(-5\right)+\left(4\right)\left(4\right)$
$\left(x^2-x-1\right)\left(2x-1x-2\right)$
$x^2+ax$
$\lim_{x\to-2}\left(7x^2-4x^3-7\right)$
$5-2x\le-2$
$3.\:\left[2+\:\left(8-9\right)\right]$
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