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Question

The value of cos 1° cos 2° cos 3° _______cos 179° is ____________.

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Solution

cos 1° cos 2° cos 3° ....... cos 179°
= cos 1° cos 2° cos 3° ......... cos 90° cos 91° ......... cos 179°
= cos 1° × cos 2° × cos 3° ..... × 0 × cos 91° .......... cos 179° (∵ cos 90° = 0)
= 0 × finite
= 0
Hence, cos 1° cos 2° cos 3° ......... cos 179° = 0

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