$\int\frac{2x^2+3}{\left(x+3\right)\left(2x^2+x+2\right)}dx$
$\left(\sqrt{a}+\sqrt{b}\right)\left(\sqrt{a-\sqrt{b}}\right)$
$-2x^5+3x-2:x^2-x+1$
$\lim_{x\to0}\left(\frac{in\left(5\cdot x+1\right)}{2^x-1}\right)$
$\frac{12x^5}{4x^7}$
$9x^2-54x-81$
$\lim_{x\to0}\left(xe^{-2x}\right)$
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