$36x^2+90x+81$
$\left(4x-5\right)\left(x+3\right)$
$\frac{tan^2\left(\theta\right)}{tan^2\left(\theta\right)+1}$
$n^2-15n+50$
$\frac{3^5.3^{-7}}{3^2}$
$\cos x=\frac{3}{4}$
$\left(\sqrt{3}x+\sqrt{2}y\right)\left(\sqrt{3}x-\sqrt{2}y\right)$
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