$81x^2y^4+\:36xy^2z+4z^2$
$\frac{\cos^2n+\tan^2n-1}{\sin n}=\tan^2n$
$\frac{3x^2-5x^2+10x-3}{3x+1}$
$\frac{66}{11}$
$\frac{d}{dx}\frac{-3}{3x^2+1}$
$\left(-b+x\right)^5$
$-2w^2+4zxy$
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