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Questions about the Piecewise function, which is represented by different expressions for different ranges of values of its independent variable.

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1 answer
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Continuity and derivability of a multivariable function at a specific point

I have this function: f = Sqrt(Abs(x^2 - x*y)) So, how can I prove that it is derivable and/or continue in a point, like (0,0)?
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