Question

If z=x^(n)*f((y)/(x))+y^(-n)phi((x)/(y)) then prove that x^(2)(del^(2)z)/(del x^(2))+2xy(del^(2)z)/(del x del y)+y^(2)(del^(2)z)/(del y^(2)) +x(del z)/(del x)+y(del z)/(del y)=n^(2)z.​

Answer 1

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