$\left(12-y\right).\frac{3}{2}-18+\frac{3y^2}{4y}$
$\left(2\sqrt{xy}\right)\left(-2\sqrt{xy}\right)$
$\frac{x+3}{x-2}>2$
$\frac{\left(x-y\right)^{-1}}{\left(x^{-2}-y^{-2}\right)^{-1}}$
$\cos\left(x\right)\sec^2\left(x\right)-\cos\left(x\right)$
$28:-14$
$( a - b x ) ( a + b x )$
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