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Math Help - [SOLVED] Proving Trig Identities

  1. #1
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    [SOLVED] Proving Trig Identities

    I'm stuck on proving a couple trig identities.

    Ignore question 1, I got it now.
    1.
    cos2x / 1 + sin2x = 1 - tanx / 1 + tanx


    2.
    sin2x / 1 - cos2x = 2csc2x - tanx
    Last edited by peekaboos; November 13th 2008 at 05:39 PM.
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  2. #2
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    Quote Originally Posted by peekaboos View Post
    I'm stuck on proving a couple trig identities.

    1.
    cos2x / 1 + sin2x = 1 - tanx / 1 + tanx

    [snip]
    Do it exactly the same way as you were shown here: http://www.mathhelpforum.com/math-he...dentities.html

    Note that \frac{1 - \sin (2x)}{\cos (2x)} = \frac{(1 - \sin (2x)) (1 + \sin (2x))}{\cos (2x) (1 + \sin (2x))} = \, ....
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  3. #3
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    Quote Originally Posted by peekaboos View Post
    I'm stuck on proving a couple trig identities.

    Ignore question 1, I got it now.
    1.
    cos2x / 1 + sin2x = 1 - tanx / 1 + tanx

    2.
    sin2x / 1 - cos2x = 2csc2x - tanx
    Try thinking a bit more about your questions before posting them. That way, people won't waste their time answering questions that you've already figured out how to do in the meantime.
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  4. #4
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    Alrights, sorry. I get frustrated but then later on I calm down and I can figure it out easier. I don't know, it's just me but I'll keep that in mind.
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