$\frac{5}{3}+\frac{1}{3}$
$\frac{x}{3}-\frac{1}{2}<\frac{7}{6}$
$8x+4^2$
$12x^2+4x=0$
$10z+5w$
$s^2-4s-21$
$\frac{1-\tan\left(\frac{a}{2}\right)^2}{1+\tan\left(\frac{a}{2}\right)^2}$
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