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Question

A: The angle between the vectors ^i2^j+^k,2^i^j^k is π3.
R: If θ is the angle between a,b then cosθ=a.b|a||b|.

A
Both Aand R are true and R is the correct explanation of A
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B
Both Aand R are true and R is the not correct explanation of A
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C
A is true but R is false
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D
A is false but R is true
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