$6x-13\le17$
$37x-6x$
$\frac{cos\left(-x\right)cot\left(-x\right)}{sin\left(-x\right)}$
$1-\frac{2}{x^2+1}$
$\lim_{x\to\frac{\pi}{4}}\left(\frac{tan\left(x\right)-1}{\left(x-\frac{\pi}{4}\right)^2}\right)$
$tanx-\frac{3}{4}=0$
$\sin\frac{x}{2}=0$
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