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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