Question: If vec ( r ) = xhat ( ) + yhat ( ) + zhat ( k ) and r = | v e c

If vec(r)=xhat()+yhat()+zhat(k) and r=|vec(r)|, show that div (gradrn)=n(n+1)rn-2.
If vec ( r ) = xhat ( ) + yhat ( ) + zhat ( k )

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