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The value of (1+cos(pi/9))(1+cos((3pi)/9...

The value of `(1+cos(pi/9))(1+cos((3pi)/9))(1+cos((5pi)/9))(1+cos((7pi)/9))` is

Answer

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Find the value of (1+cos (pi/8))(1+cos(3pi/8))(1+cos(5pi/8))(1+cos(7pi/8))

Evaluate: (1+cos(pi/8))(1+cos(3pi/8))(1+cos(5pi/8))(1+cos (7pi/8))

Knowledge Check

  • (1+cos (pi//8))(1+cos(3pi//8))(1+cos(5pi//8)) (1+cos(7pi//8))=

    A
    `1//2`
    B
    `cos(pi//8)`
    C
    `1//8`
    D
    `(1+sqrt(2))//2sqrt(2)`

  • Solve cos(pi/9)+cos(pi/3)+cos((5pi)/(9))+cos((7pi)/(9)) ?

    A
    1
    B
    `-1`
    C
    `-1/2`
    D
    `1/2`

  • 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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