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The value of (cos ^(2) ""(pi)/(12)+ cos^...

The value of `(cos ^(2) ""(pi)/(12)+ cos^(2) ""(pi)/(4)+ cos ^(2) ""(5pi)/(12))` is-

A

`3/2`

B

`2/3`

C

`3/4`

D

`4/3`

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The correct Answer is:
A
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  • The value of cos ""pi/7 cos ""(2pi)/(7) cos ""(3pi)/(7) is-

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