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The value of (1+ "cos" pi/6)(1+"cos" pi/...

The value of `(1+ "cos" pi/6)(1+"cos" pi/3)(1+ "cos" (2pi)/3)(1+"cos" (7pi)/6)` is

A

`3/16`

B

`3/8`

C

`3/4`

D

`1/2`

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The correct Answer is:
A
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