$2u^2-u-1=0$
$\left(2x^3\:+\:3y^4\right)^2$
$\left(4x+1\right)\cdot\left(3x-1\right)$
$3x^2-15x<0$
$\sec^2x=-2\sec x$
$\lim_{x\to0}\left(\frac{\left(x+123\right)}{e^x}\right)$
$-1\:\left(23\right)+5$
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