$8\left(\cot\left(\frac{\pi}{2}-x\right)\right)\cos\left(x\right)$
$9a-18$
$\:-s-5\left(3s-8\right)$
$32x^3-12x$
$8\cos^2x\:-2\cos x-1=1$
$9x^6-4y^2$
$9x^2+36y^2+4z^2-36=0$
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