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The value of co s pi/5 co s.2pi / 5 c o ...

The value of `co s pi/5 co s.2pi / 5 c o s 4pi / 5 co s 8pi / 5 = `

A

`1/16`

B

0

C

`-1/8`

D

`-1/16.`

Text Solution

Verified by Experts

The correct Answer is:
D
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