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That change may be determined from the partial derivatives as du u r dr u. The laplacian is del 2 1 r 2 partial partialr r 2partial partialr 1 r 2sin 2phi partial 2 partialtheta 2 1 r 2sinphi partial partialphi sinphipartial partialphi. Cool Math Tricks Deriving The Divergence Del Or Nabla Into …