$68.5\cdot4.7$
$5x^{3y}-20x^{2y}^2+100xy$
$36p^2-49q^2$
$\left(\sqrt{2}x\right)^3$
$\lim_{x\to0}\left(\frac{\left(1-2cosx+\cos\left(x\right)^2\right)}{x}\right)$
$\left(2xy^2-3\right)dx+\left(2x^2y+5\right)dy=0$
$\lim_{x\to3}\left(\frac{x^2-9}{-6x-18}\right)$
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