cos (36° - A) cos (36° + A) + cos(54° + A) cos (54° - A) = ? - Vidyadip

MCQ

cos (36° - A) cos (36° + A) + cos(54° + A) cos (54° - A) = ?

A
sin A
B
sin 2A
✓
cos 2A
D
cos A

✓

Answer

Correct option: C.

cos 2A

C

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