The value of the expression cos1°. cos2°. cos3°. cos179° = A) -1 B) 0 C) 1/root2 D) 1

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The value of the expression cos1°. cos2°. cos3°. cos179° =

 A) -1 

 B) 0

 C) 1/root2 

 D) 1


Option is

 B) 0


Explanation:

cos1° cos2° cos3° … cos179°

= cos1° cos2° cos3° ... cos90° … cos179°  

= 0  ...[∵ cos90° = 0]

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