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If \(u=x^2 tan^{-1} (\frac{y}{x})-y^2 tan^{-1} (\frac{x}{y})\) then \(\frac{∂^2 u}{∂x∂y}\) is?

Posted: Thu Jul 14, 2022 9:29 am
by answerhappygod
a) \(\frac{x^2+y^2}{x^2-y^2}\)
b) \(\frac{x^2-y^2}{x^2+y^2}\)
c) \(\frac{x^2}{x^2+y^2}\)
d) \(\frac{y^2}{x^2+y^2}\)