The magnitudes of vectors \( \vec{A}, \vec{B} \) and \( \vec{C} \) are 3,4 and 5 units respectiv...

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The magnitudes 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
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