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Question

Let ¯a,¯b be unit vectors, ¯a¯b If ¯r is a vector such that |¯r|=2,(¯a,¯r)=π3 and (¯aׯb)×(¯aׯr)=¯a Then (¯b,¯r)=

A
π4
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B
π6
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C
π3
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D
π2
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