$\sin\left(x+20\right)=\frac{1}{2}$
$\frac{d}{dx}\left(x^{cot\left(x\right)-sin\left(x\right)}\right)$
$\frac{\sqrt{ax}}{20}$
$\lim\:_{x\to\:+\infty\:\:}\left(x-ln\left(3x^2+6\right)\right)$
$x^2-8x+13=0$
$4x^2-x-5$
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