If a^ and b^ are unit vectors and if a^×b^=3a^⋅b^, then the magnitude of the vector (a^ − b^) is
2
1
3
In the data, a^×b^=sinθ and a^⋅b^=cosθ. Using these gives θ = 60o.a^−b^=12+12−2×1×1×cos60o