Cosine of an angle between the vectors \( (\vec{a}+\vec{b}) \) and ...

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Cosine of an angle between the vectors \( (\vec{a}+\vec{b}) \) and \( (\vec{a}-\vec{b}) \) if \( |\vec{a}|=2,|\vec{b}|=1 \) and \( \vec{a} \wedge \vec{b}=60^{\circ} \) is
(A) \( \sqrt{3 / 7} \)
(B) \( 9 / \sqrt{21} \)
(C) \( 3 / \sqrt{7} \)
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