$7^{-x}\cdot7^{-x}$
$20n^8\cdot5n^{-8}$
$\sqrt[6]{y^5\sqrt[3]{y^2}}$
$\left(x^2-2xy+y^2\right)\left(x+y\right)$
$16u^2+40uy+25y^2$
$\frac{sen2\left(x\right)+\cos2\left(x\right)-1}{\sqrt{1-\sin2\left(x\right)}}$
$\left(5x^a+y^b\right)^2$
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