$( x - \frac { 1 } { 2 } ) ^ { 2 }$
$20x^2+31x+12$
$xdx+xdy=0$
$\frac{100}{y^2}+\frac{5}{y}+1$
$\lim_{x\to0}\left(\frac{6-6cos}{sin2}\right)$
$\left(10+7r^2\right)+\left(6r^2-18-5r\right)$
$x^2+\frac{x}{2}$
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