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The wave equation given: [itex]{1\over{c^2}} {\partial^2 \phi\over{\partial t^2}} = \Delta \phi [/itex] with [itex] r = \sqrt{x^2+y^2+z^2}[/itex] needs to be rearranged, so that [itex]{1\over{c^2}} {\partial^2 ( r \phi) \over{\partial t^2}} = {\partial^2 (r \phi) \over{\partial r^2}} [/itex].

Are there any tricks to obtain this result?

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# Rearranging wave equation

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