Calculate del.r(A.r) with Constant Vector A & Distance Vector r

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fizali
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ı need to learn how can ı calculate ' del . r (A . r) ' where 'A' is a constant vector , 'r' is a distance vector and '.' is dot product. the result must be 4(a.r)
 
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how can ı find the solution of the this equation. ' del . r (r.A)= 4(r.A) '