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                                    9.If is the angle between unit vectors A andis equal to(1 - AB)B, then(1 + A.B)1) tan? (/2)3) cot (012)2) sin(/2)4) cos? (012) | 
                            
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Answer»  OP tion A hsjskslalskdkskfkri bshjdisk bdjdiufufrhr grhriririi hrjroro  | 
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