$1x^2+1x-1<0$
$4ab+\left(a-2b\right)^2-a^2-4b^2$
$\frac{dy}{dt}=-\frac{1}{50}\left(y-23\right)$
$-2x+1=-1$
$\lim_{x\to0}\:\left(\frac{\frac{1}{x}-\frac{1}{2}}{x-2}\right)$
$\int\frac{2x+19}{x^2+7x+19}dx$
$\left(x-5x^2\right)\left(\frac{1}{2x\frac{1}{2}}\right)$
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