$\frac{\left(2x^3-3x^2+5x-4\right)}{x^3-x+1}$
$\lim_{x\to0}\left(\frac{1+x^2-\sqrt{\cos\left(6x\right)}}{1-x^2-\sqrt{\cos\left(4x\right)}}\right)$
$7\cos x=7\sin x$
$\left(\frac{a}{b^3}\right)^4$
$6x^2-6x-12$
$\left(xy\right)^{-\frac{1}{2}}$
$\int\left(\frac{3r}{\sqrt{1-r^2}}\right)dr$
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