1.

If \[|\,\vec{A}+\vec{B}\,|\,=\,|\,\vec{A}\,|+|\,\vec{B}\,|\], then angle between \[\vec{A}\]and \[\vec{B}\] will be    [CBSE PMT 2001]

A.        \[\text{9}0{}^\circ \]      
B.        \[\text{12}0{}^\circ \]
C.        \[0{}^\circ \]      
D.        \[\text{6}0{}^\circ \]
Answer» D.        \[\text{6}0{}^\circ \]


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