$\sqrt{9}\sqrt{5}$
$\frac{x^2-4x-20}{x+3}$
$sinx=0,766$
$\cot^2\left(30^{\circ}\right)-\cos^2\left(30^{\circ}\right)=\cot^2\left(60^{\circ}\right)\cos^2\left(30^{\circ}\right)$
$\frac{d}{dx}\frac{3x^2}{2y}$
$\int\:\frac{1-5u}{5u^2-4u}du$
$-10+8y+14+5y-13-20y$
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