$\lim_{x\to0}\left(\frac{2x^2}{\tan\left(x\right)}\right)$
$3+\frac{3}{1}$
$x=3x+14$
$-4\:\:+\:9\:.\:2$
$6x^2-x-15$
$\int\frac{\sqrt{x^2-4}}{x}dx$
$\frac{d}{dx}\left(xy^2+y^2=x^4\right)$
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