Question

If u=tan-1 xy/√(1+x^2+y^2) , show that del^2u/del x ×del y = 1/ (1+x^2+y^2)^3/2
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Answer 1

Step-by-step explanation:

u=tan-1 xy/√(1+x^2+y^2) , show that del^2u/del x ×del y = 1/ (1+x^2+y^2)^3/2