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    lee1111's Avatar
    lee1111 Posts: 7, Reputation: 1
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    #1

    Mar 20, 2011, 01:29 AM
    trigonometry
    tan2A+tan3A+tan2Atan3Atan5A=
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Mar 20, 2011, 11:37 AM

    I'm guessing those are coefficients of A.

    Use:
    lee1111's Avatar
    lee1111 Posts: 7, Reputation: 1
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    #3

    Mar 20, 2011, 11:42 AM
    I used tan2Atan3Atan5A=tan5A-tan3A-tan2A... is this method correct??
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Mar 20, 2011, 11:52 AM

    I don't know this identity, but it's valid :)
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