$\left(7+2b\right)\left(7-2b\right)$
$2.8-.3$
$\left(4x^2+\frac{1}{2}y^5\right)^2$
$\left(m-4\right)^{2}$
$\left(9x-\frac{1}{\sqrt{3x}}\right)$
$\frac{dy}{dx}\left(y=-2x+4\right)$
$\frac{4x^2-5x-7}{2x^2+2}$
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