$\sin\left(2x\right)\sin\left(x\right)+\cos\left(x\right)$
$\int x\cdot\frac{arctgx}{\sqrt{1+x^2}}dx$
$\int\left(x^8\left(\sqrt{1+x^3}\right)\right)dx$
$\lim_{x\to0}\left(\frac{2^n}{5^{n-1}}\right)$
$2x^2-13x-21=0$
$\lim_{x\to2}\left(x^2-3x\right)^2$
$2x^2+9x+10=0$
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