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Prove that sin 78^(@) + cos132^(@) = (sq...

Prove that `sin 78^(@) + cos132^(@) = (sqrt(5)-1)/(4)`.

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Knowledge Check

  • sin 78^(@) - sin 18^(@) + cos 132^(@) =

    A
    0
    B
    1
    C
    2
    D
    3

  • The value of cos^(-1)((sqrt(5)-1)/4)=

    A
    `(3pi)/10`
    B
    `(2pi)/5`
    C
    `(pi)/5`
    D
    `(pi)/15`

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