$x+\frac{2}{x^2-1}$
$\left(6mn^3+3m^2\right)^2$
$-67-\left(98-12\right)$
$\left(-4\right).\left(10-12\right)+\left(15-4-1\right):\left(-5\right)$
$log\:\left(5x\right)\:=\:log\:\left(2x+9\right)$
$-3+x^2+x^2+3y^2$
$\frac{d^2}{dx^2}\left(2\pi^{2\pi}\right)$
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