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2014-10-31T16:38:32+05:30

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Cos 1 × cos 2 × cos 3 × ......× cos 179
= cos 1 × cos 2 × cos 3 × .....× cos 90 × ..... × cos 179
= cos 1 × cos 2 × cos 3 × .....× 0 × ..... × cos 179
0 × cos 1 × cos 2 × cos 3 × ....... × cos 179
0
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2014-10-31T16:41:55+05:30
 cos 1 cos 2 cos 3......cos 179cos 1× cos 2× cos 3× ..........cos50×cos51.........cos89× cos 90........cos179

As cos90 has the value 0 the whole answer will be zero.

cos 1× cos 2× cos 3× ..........cos50×cos51.........cos89× 0........cos179

=0 is the answer
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