Answers: 3
![\frac{1 + cos [2(A-B)]}{2} - \frac{1 - cos [2(A+B)]}{2}](/tpl/images/0582/6411/98302.png)
![\frac{1}{2} + \frac{1}{2} cos[2(A-B)] - \frac{1}{2} + \frac{1}{2} cos[2(A+B)]](/tpl/images/0582/6411/27efa.png)
![\frac{1}{2} cos[2(A-B)] + \frac{1}{2} cos[2(A+B)]](/tpl/images/0582/6411/6b644.png)
(expand using sum/difference identities)
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