$\frac{dz}{dx}=\frac{z^3+3z^2+3z+1}{x^2-2x+1}$
$2.90\cdot5$
$x^8+4x^4y^416y^8$
$3a-4a+5a$
$\frac{3}{\frac{9\pi}{4}}$
$\left(y-7\right)\left(y+1\right)$
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