If \bo {a} and \bo {b} are the two vectors such that |\bo {a}|=3 \sqrt{3},|\bo {b}|=4 and |\bo {a}+\bo {b}|=\sqrt{7}, the angle between \bo {a} and \bo {b} is

COMEDK Exam 2016 Solved Paper

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If a and b are the two vectors such that |a|=3√3,|b|=4 and |a+b|=√7, the angle between a and b is

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