The magnitude of vectors \( \vec{A}, \vec{B} \) and \( \vec{C} \) a...

The magnitude of vectors \( \vec{A}, \vec{B} \) and \( \vec{C} \) are 3,4 and 5 units respectively. If \( \vec{A}+\vec{B}=\vec{C} \), the angle between \( \vec{A} \) and \( \vec{B} \) is
(a) \( \pi / 2 \)
(b) \( \cos ^{-1}(0.6) \)
(c) \( \tan ^{-1}(7 / 5) \)
(d) \( \pi / 4 \)
\( (1988) \)
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