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The value of cos (pi)/(5) . cos (2 pi)/(...

The value of `cos (pi)/(5) . cos (2 pi)/(5). cos (4 pi)/(5) . cos (8 pi)/(5)` is

A

`(1)/(16)`

B

0

C

`-(1)/(8)`

D

`-(1)/(16)`

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HIMALAYA PUBLICATION-MEASUREMENT OF ANGLES, TRIGONOMETRIC RATIOS AND RELATION BETWEEN SIDES AND ANGLES OF A TRIANGLE-QUESTION BANK
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