$\lim_{x\to\frac{\pi}{2}}\left(\frac{1}{x^2}\right)$
$\frac{1+x}{2}\:=\:1$
$\left(q^2-2q+5\right)\left(q^2-5\right)$
$\frac{dy}{dx}=30-6x-5y+xy$
$3x^{3}+9x^{2}+6x^{3}-2x^{2}+9-12$
$\left(-6\right)\cdot\left(-4\right)+20:2$
$9x-1<2$
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