$-9\tan^2+2=0$
$\frac{x^{2}-28}{x-5}$
$2r^2\:-\:2r^2$
$\frac{x}{3}+5=10$
$\frac{3+x^2}{x}$
$\lim_{x\to0}\left(9x\ln\left(4x\right)\right)$
$\left(x\sqrt{9}+\sqrt{3}\right)$
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