$\tan^3\left(x\right)=3\tan\left(x\right)$
$\lim_{x\to1}\left(\frac{x^2-2x+1}{x^3-2x^2-x+2}\right)$
$\frac{1}{\sqrt{a^2+1}}$
$\frac{dy}{dx}\left(3x^3-2x^2y+5xy=y-3x\right)$
$-7x^5+x^5-xy$
$1^23$
$\frac{+x^2-3x^2+5x-1}{x^2-x+5}$
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