$\sqrt[4]{z^{12}}$
$a^22ab+b^2-3a-3b-4$
$-1=\frac{-x-2}{x^2-5x}$
$\int e^{x^2\:+2x+1}dx$
$81m^2-90mn+25n^2$
$e^x\left(e^x+e^{2x}\right)^2$
$\left(\frac{1}{4x}+2\right)^2$
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