$tan^2x+6tanx+2=0$
$\lim_{t\to\infty\:}\left(\frac{2e^t-2}{t}\right)$
$3x-1>x+2$
$\left(x-1\right)^3\cdot\left(x-3\right)^2\cdot\left(x+2\right)$
$\frac{d}{dx}x^2=y-xy$
$\lim_{x\to0}\frac{1}{x\cdot2}$
$\sqrt[2]{-81}$
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