$x^2+2x+5\ge0$
$0.9\cdot10$
$\int\frac{30x^2}{\sqrt{100-x^2}}dx$
$x^2y'-2xy=3y$
$5\left(2-j\right)+\left(2j-3\right)$
$-3x+7x-9$
$\frac{9x^3+3x^2+4x+4}{3x+2}$
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