$\frac{cos\:2x-1}{sin\:2x}$
$20x-14>0$
$\left(\frac{2}{3}y^3-\frac{3}{4}x\right)^3$
$-11-\left(-6+4\right)$
$\left(a+x+y\right)^2$
$3x+2x-x+2^2$
$4t^2+15t-19$
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