$\int x^3\left(a^2+x^2\right)dx$
$6x+6y+9z=10$
$\frac{1}{\cos^2a}-1=\tan\left(a\right)$
$2x^2+2x+x^2+2$
$x^2+x+30=0$
$\lim_{x\to1}\left(\frac{-2x}{\cos\left(\pi x\right)\cdot\pi}\right)$
$6x+1+7x$
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