$h^2+10h-11=0$
$\frac{1}{x-\frac{2}{x+\frac{1}{2}}}\cdot\frac{1}{2+\frac{1}{x}}$
$-5x^3y^2-1+x;\:x=-3;\:y=-1$
$\frac{3x^2-6x}{x^2-x-6}$
$\left(3tz\right)^5$
$\lim_{x\to\pi}\left(\frac{\cos\left(x\right)}{cos\left(x+\pi\right)}\right)$
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