16. The value of cos 1° cos 2º cos 3º
3
cos 179°
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Given : cos 1° cos 2° cos 3° ....... cos 179° cos 180°.
cos 1° cos 2° cos 3° ....... cos 179° cos 180°.
= cos 1° cos 2° cos 3° .......cos 89° cos 90° cos 91°…….. cos 179° cos 180°.
= cos 1° cos 2° cos 3° ...... cos 89° (0) cos 91°…….. cos 179° cos 180°.
[because, cos 90° = 0]
Hope that helps !
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