$x^2-18x-19$
$y1=\frac{x}{x^2-3x-10}$
$\tan\left(x\right)-\cot\left(x\right)=-2.\cot\left(2x\right)$
$q^2-20q$
$\:\:\left(7x^2-x\right)^2$
$\frac{\sqrt{2-x}}{x}-\frac{x+1}{x}$
$\frac{78}{6}$
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