$\frac{1}{1-2\cdot sin\left(x\right)^2}=1$
$\left(9-2n\right)^2$
$\frac{dy}{dx}=\frac{\left(1+x\right)}{xy^2}$
$\lim_{x\to-2}\left(\frac{x^2-8x+12}{x-2}\right)$
$\int\:\frac{2}{x^2+3x+1}dx$
$-3+7-136-66-1$
$3\cdot9\cdot\left|\left(-5\right)\right|-7$
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