$9-\left[\left(-5\right)-\left(+17\right)\right]$
$4x^2-12x+0$
$8x^2y^3\cdot6x^2$
$\frac{2x^3+8x+32}{-12x-24}$
$\frac{x+1}{x+1}$
$cosx-1=cos2x$
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