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The value oif the expressin (1+cospi/10)...

The value oif the expressin `(1+cospi/10)(1+cos(3pi)/10)(1+cos(7pi)/10)(1+cos(9pi)/10)` is

A

`1//8`

B

`1//16`

C

`1//4`

D

0

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The correct Answer is:
B
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MOTION-TRIGNOMETRIC RATIOS & IDENTITIES -Exercise 1
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