If \( \cos (A-B)=3 / 5 \) and \( \tan A \tan B=2 \), then (A) \( \cos A \cos B=1 / 5 \) (B) \( \...

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If \( \cos (A-B)=3 / 5 \) and \( \tan A \tan B=2 \), then
(A) \( \cos A \cos B=1 / 5 \)
(B) \( \sin A \sin B=-2 / 5 \)
(C) \( \cos A \cos B=-1 / 5 \)
(D) \( \sin A \sin B=-1 / 5 \)
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