$\sqrt{3}tan^2\:a-3\:\tan a=0$
$2xy-10xyz$
$\left(x+4\right)^2+\left(y-3\right)^2=36$
$\lim_{x\to1}\frac{1-x}{\left(x-1\right)lnx}$
$\int_4^{\infty}\left(\frac{1}{x^2-\frac{b}{a}}\right)dx$
$4x^2-2x+0.25$
$\frac{d}{dx}\left(6x^{-3}+9x^{-1}\right)$
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