# Find the angle be

i)

We know that ,

cosθ = √3/2

θ = cos - 1(√3/2) = 30⁰ =

Ans: θ = cos - 1(√3/2) = 30⁰ =

ii)

We know that ,

cosθ = - 1/2

θ = cos - 1( - 1/2) = 120⁰ =

Ans: θ = cos - 1( - 1/2) = 120⁰ =

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