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THe value of cos^2(pi/12)+cos^2(pi/4)+c...

THe value of `cos^2(pi/12)+cos^2(pi/4)+cos^2((5pi)/12)` is

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Find the value of 2cos((5pi)/12) cos(pi/12) and 2sin((5pi)/12)cos(pi/12)

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Knowledge Check

  • The value of cos ( pi //5) cos ( 2pi //5) cos ( 4pi //5) cos ( 8pi //5) is

    A
    `1//16`
    B
    0
    C
    `-1//8`
    D
    `-1//16`

  • The value of cos ( pi //5) cos ( 2pi //5) cos ( 4pi //5) cos ( 8pi //5) is

    A
    `1//16`
    B
    0
    C
    `- 1//8`
    D
    `- 1//16`

  • The value of "cos"^(2)(pi)/16+"cos"^(2)(3pi)/16+"cos"^(2)(5pi)/16+"cos"^(2)(7pi)/16 is

    A
    1
    B
    0
    C
    `-1`
    D
    2

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    The value of cos (pi)/(5) . cos (2 pi)/(5). cos (4 pi)/(5) . cos (8 pi)/(5) is

    The value of cos^(2)((pi)/(20))+cos^(2)((2 pi)/(20))+cos^(2)((3 pi)/(4))+......+cos^(2)((9 pi)/(20)) is

    The value of cos((pi)/(15))cos((2 pi)/(15))cos((4 pi)/(15))cos((8 pi)/(15))=

    The value of cos""(pi)/(15)cos""(2pi)/(15)cos""(4pi)/(15)cos""(8pi)/(15) is

    The value of sin(pi/48)cos(pi/48)cos(pi/24)cos(pi/12)cos(pi/6)cos(pi/3) is:

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