$\tan^2w\cos^2w$
$\left(x-2y+3\right)^2$
$x^2-20x+19=0$
$\left(\frac{2}{s^2+2^2}\right)+\left(\frac{1}{s-3}\right)$
$\frac{6}{\sqrt{a-2}}$
$-25+\frac{14}{7}$
$y=\frac{1}{3}x^3-\frac{1}{2}x^2-6x$
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