Question

what is commom between dxy and dx^2-y^2 ?​

Answer 1

Answer:

$d {x}^{2} - {y}^{2} \\ = ( \sqrt{d} x)^{2} - (y)^{2} \\ =( \sqrt{d} x + y)( \sqrt{d} x - y) \\ \\a nd \: \\ dxy \\ d \times x \times y$

Nothing is similar between

$dxy \: and \: d {x}^{2} - {y}^{2}$

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