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Iknow that if we have delta function of one variables function, then we can write it as:

[itex]\delta (f(x)) = \sum \frac{\delta(x-x0)}{f'(x0)} [/itex]

but how we can write a function of two variables:

[itex]\delta (f(x,y))[/itex]

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# Delta function of two variable function

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