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    robdhunter's Avatar
    robdhunter Posts: 1, Reputation: 1
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    #1

    Dec 13, 2008, 11:37 PM
    trigonometric identities
    1-tan2a5/1+tan2a=cos2a-sin2a
    Credendovidis's Avatar
    Credendovidis Posts: 1,593, Reputation: 66
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    #2

    Dec 14, 2008, 06:25 AM
    Dear Rob,

    And your question is?

    I did trigonometry, but unfortunately failed the mind-reading course...

    Maybe this link to Dave's Short Trig Course will help you. Special attention for chapter 16 : Summary of trigonometric identities.

    If not please state clearly with what I can help you...

    :)
    DollyHolly's Avatar
    DollyHolly Posts: 1, Reputation: 1
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    #3

    Mar 30, 2009, 06:24 PM

    (1+cos(x))/(sin(x)) + (sin(x))/(1+cos(x))=2 csc(x)
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #4

    Mar 31, 2009, 06:48 AM
    Quote Originally Posted by DollyHolly View Post
    See here:

    https://www.askmehelpdesk.com/math-s...es-324123.html
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