$20n^{2}-9n-20$
$\sin\left(\frac{x}{6}\right)\cos\left(\frac{x}{6}\right)=\frac{1}{4}$
$x^4+2x^2-1$
$\left(5x+y^3\right)^4$
$6s-8s-5+9$
$y^2-2y-y^2-2y$
$\frac{sin^2x}{\left(1-cosx\right)^2}=\frac{1+cosx}{1-cosx}$
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