$3\tan^3x-\tan x=0$
$f\left(x\right)=3x^2-16x+21$
$\lim_{x\to-\infty}\left(\frac{x-2}{x^2-1}\right)$
$x^2+8x-29$
$\left(4+16\right)\:-\:\left(6-3\right)$
$\int\frac{2\sin\sqrt{x}}{\sqrt{x}}dx$
$\int\left(5x^3\right)\sqrt{1-x^2}dx$
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