$\frac{2x^2}{2x^2-4x+3}$
$k^3-5k^2-k+5$
$2x\geq10$
$y''+2y'+2y=0$
$\int5^{\left(x^4-2x\right)}\left(2x^3-1\right)dx$
$\left(b^2-2c^3\right)^2$
$9\cdot40$
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