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Math Help - here are some more identities that is started on today in summer school.

  1. #1
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    here are some more identities that i started on today in summer school try 1 if u can

    theta=(T) degrees=(D)
    1)prove:tan(T)-cot(T)/tan(T)+cot(T)=2sin^2(T) - 1
    2)prove:1-cos(T)/sin(T)=sin(T)/1+cos(T)
    3)prove:1-tan^2(T)/1+tan^2(T)=1 - 2sin^2(T)
    Last edited by jimC; July 17th 2008 at 02:49 PM.
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  2. #2
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    Quote Originally Posted by jimC View Post
    theta=(T) degrees=(D)
    1)prove:tan(T)-cot(T)/tan(T)+cot(T)=2sin^2(T) - 1
    2)prove:1-cos(T)/sin(T)=sin(T)/1+cos(T)
    3)prove:1-tan^2(T)/1+tan^2(T)=1 - 2sin^2(T)
    If you've just started this work it's natural that you'll experience initial difficulty. Having someone do the work for you is not the way to overcome this difficulty.

    It's better that you invest some time and effort in trying to do them yourself. Then post the work you've done and state where you get stuck.

    The help you get will then be much more beneficial.
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  3. #3
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    work ive done

    the 1st one i know i have to change the tan and cot to cos over sines i think but then im still tuck after that.

    the second one maybe i change the cos over sin to cot or im still not sure on that 1st step.

    the third one seems to be something with the pythagerous ID but then im still stuck.
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