Question

If f(x, y) = x

2

tan−1

(y

x

)

− y

2

tan−1

(

x

y

)

, evaluate x

2 ∂

2f

∂x2

+ 2xy

∂

2f

∂x∂y + y

2 ∂

2f

∂y2​

Answer 1

Answer:

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