$a^2+b^2=53$
$\lim_{x\to\infty}\left(\frac{e^x}{x}\right)^2$
$45x^2-500$
$\left(y^{-2}\right)^{-3}$
$\int e^{-o}\cos\left(2o\right)do$
$6x^2-6x-1$
$15\:<\:6x\:+\:3$
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