$n^{2\:}=4$
$8x^2y-50m^2y$
$213.5+175.5$
$\left(1000\right)^2\:+\:2\left(1000\right)\:+1$
$\int\frac{ln\left(secx\right)}{cotx}dx$
$\left(7a-3b\right)\left(7a+3b\right)$
$8+9\left(-3\right)$
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