$\left(\frac{n^2}{2^n}\right)\left(x-4\right)^n$
$9\left(z+4\right)$
$100x^2-120x+36$
$2x+5x-x+6x-9x$
$\frac{dy}{dx}=\:\left(1+x^2\right)\left(1+y\right)$
$\left(2m^3+2n^2\right)^2$
$\frac{x^{-1}y-1}{x^{-2}-y^{-2}}$
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