$\lim_{x\to\frac{\pi}{2}}\left(\frac{18x-9\pi}{\cos\left(2\pi-x\right)}\right)$
$3\left(x+5\right)+7\:>\:5\left(x+2\right)$
$5-3\cdot4$
$-2x^2+18-36$
$\frac{\left(-1\right)^n\cdot n}{2^{2n-1}}\cdot\left(x+3\right)^n$
$2x^2-x=2$
$-\frac{2}{3}y-\frac{1}{2}y$
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