$\frac{-4x^7+10x^5-8}{2x^3}$
$80\cdot70$
$\lim_{x\to2}\left(\frac{x^2-4}{x^2-5x-6}\right)$
$\left(1+x\right)\tan\left(y\right)\frac{dy}{dx}=x$
$-7tan\left(x\right)-14=tan\left(x\right)-6$
$a^8-2a^4b^4+b^8$
$\left(12x^3y^2-9z^2\right)$
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