$-81+9a^{10}$
$\left(\sqrt{2x+\sqrt{3y}}\right)\left(\sqrt{2x-\sqrt{3y}}\right)$
$3.\left(2\right)-2\left(-4\right)$
$\frac{5x+2}{7x^2}+\frac{8x+2}{7x^2}$
$\left(1-b^2\right)\left(1+b^2\right)$
$2x^2-3x-18=0$
$y=\frac{\left(4x-2\right)^3}{3x^2+7}$
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