$\left(\frac{1}{2}x-2y\right)^4$
$\left(2-2\sin\left(x\right)\right)^2$
$3x^{-3}y^{-3}\cdot4x^3y^4$
$7-\left(8+4\right)+6$
$12x^2+20x+3$
$\frac{x^6-n^6}{x+a}$
$-3x^2+3y$
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