Question

(iv) cos 1° cos 2º cos 3º... cos 180º = 0
2​

Answer 1

Answer:

Value of equation above is 0, because in this cos 90 is also being multiplied. since value of cos 90 is 0 so whole equation becomes 0.

=cos1.cos2.....cos90...cos 180

= cos 1. cos 2.... (0)...cos 180

= 0

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Answer 2

cos 1° cos 2°.... cos 90°..... cos 180°

= cos 1° × ..... (0) ....... × cos 180°

= 0.

NOTE : cos 90° = 0