$3x^2y-7xy^3+2xy^2$
$3x^m+\frac{3}{x^m}$
$5r\:-\:6x\:+\:3x\:+\:45\:-\:25\:+\:2r$
$\left(1\right)\left(2\right)+\left(-1\right)\left(0\right)+\left(0\right)\left(-1\right)$
$\frac{x^2-4}{11-2x}$
$\left(3x-5n\right)^2$
$\sin\left(2x\right)+2\sin^2\left(45-x\right)$
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