$cot\left(x\right)-csc\left(x\right)=-\frac{sin\left(x\right)}{1+cos\left(x\right)}$
$\int kdx$
$\lim_{x\to1}\left(\frac{\left|x-1\right|}{x^2-2x+1}\right)$
$4-\left(-3\right)+\left(-2\right)$
$\sqrt{x+\sqrt{x+\sqrt{x}}\cdot\sqrt{x}}$
$\left(\sqrt{a}+1\right)\left(\sqrt{a}-1\right)$
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