$\left(3z+z^2\right)\left(3z+z^2\right)$
$\sec\left(x\right)^2=\csc\left(x\right)^2+1$
$\frac{x^3-x^2-5x-3}{x-3}$
$2\cos x-\cos2x-1=0$
$\frac{d^2}{dx^2}\left(r=\frac{12}{x}-\frac{4}{x^2}+\frac{1}{x^4}\right)$
$x^3+3x^2+x-2$
$\frac{4\cdot y^7}{2\cdot y^1}$
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