$\lim_{x\to3}\frac{2}{x-3}$
$\int_{\pi}^{2\pi}\left(x\right)dx$
$f\left(x\right)=\frac{dy}{dx}\left(tanx+cotx\right)$
$\lim_{x\to0}\left(\frac{e^x-1}{e^{2x-1}}\right)$
$6x^2+x=2$
$\left(\frac{x^2+1}{2}\right)\arctan\left(x-\frac{x}{2}\right)$
$15a+8b-16a$
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