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Math Help - Relationship between Cos2A and Cos4A

  1. #1
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    Relationship between Cos2A and Cos4A

    Hi
    How can these be expressed as the other?
    So, waht is the relationship, in terms of identities, of cos4A to cos2A?

    Thanks
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  2. #2
    Air
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    Quote Originally Posted by 200001 View Post
    Hi
    How can these be expressed as the other?
    So, waht is the relationship, in terms of identities, of cos4A to cos2A?

    Thanks
    \cos (4a) = \cos (2a + 2a). \cos 2a is double angle and there are identities for that.
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