$\frac{3x+1}{x^2+4x+3}$
$\frac{d}{dx}\left(y^2=ln\:xy\right)$
$\frac{5-x}{2}+\frac{6-x}{5}\ge3$
$9x^2-3x+25y^2+150y=36$
$x^2+10x-9=0$
$\left(0.1587\right)^7\cdot\left(0.8413\right)^5$
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