$-2x^3-2x^2\:+\:3x^2-7$
$-2x^2+4x>30$
$17-\left(-1\right)+\left(-1\right)$
$-5+\left(-2\right)-\left(-4\right)\:-\left(-5\right)$
$\frac{cos\left(-2\right)-cos\left(8x\right)}{2}$
$\lim_{x\to e}\left(\frac{1-e^{x-e}}{x-e}\right)$
$\sec a=-\frac{\sqrt{3}}{3}$
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