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2015-10-06T22:22:53+05:30

This Is a Certified Answer

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Cos1.cos2.cos3.......... cos179
= cos1.cos2.cos3....cos89.cos90.cos91...... cos179
= cos1.cos2.cos3....cos89 × 0 × cos91...... cos179   (because cos90 = 0)
= 0

Answer is 0.
2 5 2
2015-10-07T22:32:12+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Cos1.Cos2.Cos3...........Cos179
cos1.cos2.cos3.........cos90.......cos179
cos90=0
any thing multiplied with 0 is 0
1 4 1