$x^2+2x+3\ge\:0$
$\frac{246.8}{8}$
$4\cos^2\left(2x+30\right)-1=0$
$x\left(x+2\right)+3\left(x+2\right)$
$\lim_{x\to0}\left(\frac{ln\left(3x^2+1\right)}{1-e^{-x^2}}\right)$
$\left(2z-3c\right)^2$
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