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
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) \(\frac{y^2}{x^2+y^2}\)
b) \(\frac{x^2-y^2}{x^2+y^2}\)
c) \(\frac{x^2}{x^2+y^2}\)
d) \(\frac{y^2}{x^2+y^2}\)