$12-9\:.\:3$
$9m^2-6+1m$
$\left(u+v\right)\left(2u-v\right)$
$\frac{d}{dx}\ln x^9-8\ln\left(x\right)$
$\tan\left(x\right)=\frac{8}{15}$
$\int_0^2\left(\frac{5}{x^2-1}\right)dx$
$\lim\:_{x\to\:0}\frac{\sqrt{2-x}\:-\sqrt{2}\:\:}{x}$
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