$\int\frac{1}{\sqrt{3-2x-x^2}}dx$
$3\tan^2x+5\tan x=2$
$\sqrt{a}^2\cdot\sqrt[3]{a}^3$
$\lim_{x\to0}\left(\frac{sin\left(4x\right)-x^2}{x}\right)$
$\left(-9\cdot4\right)+\left(-4\cdot5\right)$
$-\left(-9c-5.9d+7.9\right)$
$\frac{x^2+3x}{x^2+3}$
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