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2 cos ""pi/13 cos "" (9pi)/( 13) + cos "...

`2 cos ""pi/13 cos "" (9pi)/( 13) + cos "" (3pi)/(13) + cos " (5pi)/( 13) =0`

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Knowledge Check

  • The value of cos ""pi/7 cos ""(2pi)/(7) cos ""(3pi)/(7) is-

    A
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    B
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    C
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  • 2 cos(pi/3 +A)=

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    B
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    C
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    D
    `sinA - sqrt2 cos A`

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