Q. 205.0( 4 Votes )

The value of cos 1° cos 2° cos 3°…… cos 180° is
A. 1

B. 0

C. -1

D. None of these

Answer :

Given,


cos 1° cos 2° cos 3° ………………..cos 180°


cos 1° × cos 2° × cos 3° …… cos 89° × cos 90° × cos 91° ……….cos 180°


As we know from the table,


cos 90° = 0


Therefore,


cos 1° × cos 2° × cos 3° …… cos 89° × 0 × cos 91° ……….cos 180°


= 0

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