MCQ
$2 \cos A \cos B$ बराबर है-
  • A
    $\cos (A+B)-\cos (A-B)$
  • $\cos (A+B)+\cos (A-B)$
  • C
    $\cos (A-B)-\cos (A+B)$
  • D
    इनमें से कोई नहीं

Answer

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

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free