$-2x\:x\:1$
$\frac{x^2y-y}{y+4}$
$sin2x=\frac{2\left(\tan\left(x\right)-\cot\left(x\right)\right)}{tan^2\left(x\right)-cot^2\left(x\right)}$
$4x-9\le19$
$9z^2+19z^2+13z+11z+18-2+3$
$\frac{3}{x+3}+\frac{1}{6}=\frac{2}{x-2}$
$81y^2-90y+25$
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