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The value of θ ∈ (0, π/2) for which the vectors a = (sin θ)i + (cos θ)j and vector b = i - √3j + 2k are perpendicular, is equal to … (a) π/3

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The value of θ ∈ (0, π/2) for which the vectors a = (sin θ)i + (cos θ)j and vector b = i - √3j + 2k are perpendicular, is equal to …

(a) π/3

(b) π/6

(c) π/4

(d) π/2 

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Answer is (a) π/3

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