$\left(3x-7y\right)\left(3x+7y\right)$
$\left(2x^2-\frac{2}{x}\right)^{2n}$
$6\left(a^2+3b^2\right)-4\left(a^3+b^3\right)$
$z^2-4$
$\lim_{x\to3}\frac{2}{x-3}$
$\left(6x^5+2x^2\right)^2$
$y'=-\frac{\sqrt{x}}{4y}$
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