$\frac{\left(1-a^2\right)^2}{a^2+2a+1}$
$15x+2=47$
$\frac{25x-13x}{5x+25}$
$\left(4w^2+7z^2\right)\left(4w^2-7z^3\right)$
$\tan\left(\theta+\frac{\pi}{2}\right)=-\cot\theta$
$\left(x-4\right)\left(x+6\right)$
$\frac{8x^3y^{-5}}{4x^{-1}y^2}$
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