$\:\left(7x-3\right)\left(7x+3\right)$
$\left(\frac{1}{2}x^2-z\right)\left(\frac{1}{2}x^2+z\right)$
$\left(a^x-b^x+1\right)^3$
$\frac{dy}{dx}=\left(y+1\right)\sin\left(x\right)$
$x^2\frac{dy}{dx}+xy=7x^5$
$\lim_{x\to-1}\left(4x^3-x^2+3x-4\right)$
$\sqrt{4x}+\sqrt{9x}$
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