$81x^6-4y^2$
$\frac{-1^3}{-1^3}$
$-5\left(6\right)+4\left(3\right)+20$
$3\left(x^2+8x\right)$
$4a^2-12ad+9a^2$
$\:1-cot^4x=2csc^2x-csc^4x$
$\sin\left(b\right)+\frac{\cos^2\left(b\right)}{\sin\left(b\right)}$
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