MCQ
$2 \sin A \sin B$ बराबर है-
  • A
    $\sin (A+B)+\sin (A-B)$
  • B
    $\sin (A+B)-\sin (A-B)$
  • C
    $\cos (A+B)+\cos (A-B)$
  • $\cos (A-B)-\cos (A+B)$

Answer

Correct option: D.
$\cos (A-B)-\cos (A+B)$
(D) $\cos (A-B)-\cos (A+B)$

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