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If vec(a) = hat(i) + 4 hat(j) + 4 hat(k)...

If `vec(a) = hat(i) + 4 hat(j) + 4 hat(k) and vec(b) = 4 hat(i) - hat(j) + 2 hat(k)`, then `vec(a).vec(b)` is equal to 8.

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