$36a^2-60ab+25b^2$
$x^{-1}y$
$5x^2+25$
$\left(3z^2+2w\right)^2$
$\lim_{x\to1}\left(\frac{3x^2}{e^{2x-2}-x^2}\right)$
$z\left(1-z\right)^2$
$1x^2+\:4x+13$
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