$\int\cot^27xdx$
$7,96\:\cdot6,8$
$\left(1+\cot^2x\right)\tan x=\left(\csc^2x\right)\tan x$
$3x^2+5x+20x^2$
$\frac{d}{dx}e$
$\lim_{x\to0}\left(\frac{\sqrt[2]{1+x}-1+\frac{x}{2}}{x^2}\right)$
$4x-6=x+9$
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