$a^2+4x^2+4ax$
$\left(4-5x\right)\left(1-2x\right)\left(3x+2\right)$
$4x^2+8x^2+6x-5x+6$
$\int\frac{\sqrt{x^2+5}}{x}dt$
$2x^2-20x+50\ge0$
$\frac{d}{dx}tan\frac{1}{x-1}$
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