$\left(c-d\right)\left(c^3+c^2d+cd^2+d^3\right)$
$4x^2-\:2yx^2$
$\left(\frac{5}{4}x^2-\frac{1}{6}y^2\right)\left(\frac{5}{4}x^2\frac{1}{6}y^2\right)$
$-2x+4\le3x+8$
$\int\frac{\sqrt{5-1\cdot x^2}}{1\cdot x}dx$
$\frac{7}{6}+\frac{5}{6}$
$400n^2-169m^2$
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