2 A B is equal to: - Vidyadip

MCQ

$2 \cos A \cos B$ is equal to:

A
$\cos ( A + B )-\cos ( A - B )$
✓
$\cos ( A + B )+\cos ( A - B )$
C
$\cos (A-B)-\cos (A+B)$
D
None of the above

✓

Answer

Correct option: B.

$\cos ( A + B )+\cos ( A - B )$

(B)

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