Hi
Yes I did but what I achieve is the last term without factor of (1/2), don't know what to do now, what I got is (vector A power 2) and required is 1/2*(Modulus( A square)), is there any difference (A square) and Modulus(A square)
Homework Statement
can someone help prove this
(∇ x A) x A =(A.∇)A-1/2∇Modulus(A power2)
Homework Equations
The Attempt at a Solution
(∇ x A) x A =(A.∇)A-∇(A power2)