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Math Help - equivalent sin and cos functions

  1. #1
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    equivalent sin and cos functions

    determine an equivalent sine function for the cosine function.
    y=-cos2(x-pi/12)

    determine an equivalent cosine function for each sine function
    y=2sin4(x+pi)

    thank you
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    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by johett View Post
    determine an equivalent sine function for the cosine function.
    y=-cos2(x-pi/12)
    use the fact that \sin^2 \theta = \frac {1 - \cos 2 \theta}2

    determine an equivalent cosine function for each sine function
    y=2sin4(x+pi)
    use the fact that \sin \theta = \sqrt {1 - \cos^2 \theta}
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