$\frac{2x^2-23x+66}{2x^2+x+1}$
$2xy^3\cdot x^2\cdot\left(2yx^{-1}\right)^3$
$\left(sec^{\left(2\right)}x-1\right)csc=tanxsecx$
$\frac{30}{\left(-2\right)}$
$49x^2-y^2$
$\frac{3}{x+1}-\frac{x}{x-1}=2$
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