$ycos\left(xy\right)dx+xcos\left(xy\right)dy=0$
$2-3+4+1-8+2$
$\left(\cot x-1\right)^2$
$\lim_{x\to0}\left(1-sin\left(2x\right)\right)^{\frac{1}{x}}$
$\left(2+\sqrt{5}\right)\left(2-\sqrt{5}\right)$
$log\left(x\right)=1,2$
$125x^9-64y^{15}$
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