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If U=log(x^3 + Y^3 + Z^3 - 3xyz)then Prove That (del/del X + De/del Y+ Del/del Z)^2.u=-9/(x+y+z)^2

2021 6:28
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If u=log(x^3 + y^3 + z^3 - 3xyz)then prove that (del/del x + de/del y+ del/del z)^2.u = -9/(x+y+z)^2.

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