cos 1° × cos 2° × cos 3° ×……..× cos 180° is equal to: , cos 1° × cos 2° × cos 3° ×……..× cos 180° is equal to:

A. 0

B. 1

C. ½

D. -1

Correct Answer :

A. 0

Explanation

Since cos 90° = 0

The given expression

cos 1° × cos 2° × cos 3° ×….× cos 90° ×……..× cos 180°

reduces to zero as it contains cos 90° which is equal to 0