Question

if u= tan^-1 xy/✓1+x²+y² ,show that d²u/dx² =1/(1+x²+y²)^3/2​

Answer 1

Answer:

if u= tan^-1 xy/✓1+x²+y² ,show that d²u/dx² =1/(1+x²+y²)^3/2 do you Mark me as brainlist then I answered your question