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Let \(\vec{a}\; and\; \vec{b}\) be two unit vector and θ is the angle between them. Then 3 + b is a unit vector if

(A) θ = \(\frac{\pi}{4}\)

(B) θ = \(\frac{\pi}{3}\)

(C) θ =  \(\frac{\pi}{2}\)

(D) θ = \(\frac{2\pi}{3}\)

1 Answer

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Best answer

Answer is (D)

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