$\frac{1}{100}-x^2^n$
$\frac{1}{4y^2}-\frac{1}{3yz}+\frac{2}{3z^2}$
$\frac{7}{x+2}+\frac{5}{x-2}=\frac{10x-2}{x^2-4}$
$\frac{dx}{sin\:y}=x\:dy$
$4a^2b\frac{7}{3}c\frac{5}{6}$
$e^{-2\infty}$
$15a^2x+5a^2y+10a^2z$
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