The magnitudes of vectors \( \overrightarrow{\mathrm{A}}, \overrightarrow{\mathrm{B}} \) and \( ...

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The magnitudes of vectors \( \overrightarrow{\mathrm{A}}, \overrightarrow{\mathrm{B}} \) and \( \overrightarrow{\mathrm{C}} \) are respectively 12, 5 and 13 units and \( \vec{A}+\vec{B}=\vec{C} \), then the angle between \( \overrightarrow{\mathrm{A}} \) and \( \overrightarrow{\mathrm{B}} \) is :
(1) 0
(2) \( \pi / 3 \)
(3) \( \pi / 2 \)
(4) \( \pi / 4 \)
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