$2x^3+6x-2$
$3xcotx+x^2cscx$
$y'+2xy^3=4y$
$5^264$
$x^2-x^2-3$
$\lim_{x\to0}\left(\frac{exp\left(-\frac{1}{x^2}\right)}{x}\right)$
$cos^2\theta+cos\theta=2$
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