$\left(4a^2-7ab\right)\left(2a^2b\right)$
$8a^2c^2-72ac^2+162c^2$
$\left(x^3\right)\left(\frac{1}{x^3}\right)$
$\cot^2y\left(\sec^2y-1\right)=1$
$\left(\sqrt[5]{a}\right)^5$
$\frac{1}{2}\left(150\right)\left(35\right)^2$
$3x+1+4x+2+x-5$
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