4. Assume Á is a constant vector field and R = xi + yj + zk. (a) Simplify the expression (R· VR) · Ã+ V · V × ▼ × ((Ã× R) × (K × Ã)). (b) Assuming A the position vector of a point on the unit sphere centered at the origin, evaluate the above expression at R= Ã.

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A: solution