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Math Help - My Homeworh Help

  1. #1
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    Aug 2008
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    My Homeworh Help

    Please Everybody I Have a Hovework and I don't do this homework
    Please Post here

    1. show that
    Sin (x+Y+z)=Sin x Cos y Cos z+ Cos x Sin y cos z + cos x cos y sin z-sin x
    Sin y sin z
    Cos (x+y+z)= Cos x Cos y Cos z- Sin x Sin y Cos z-Sin x Cos y Sinz- Cos x
    Sin y Sin z

    Please help my HOmework

    God Bless YOu
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  2. #2
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    Oct 2008
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    This proof takes a lot of writing! But the only thing that you need to know is the following relationship:

    sin(a+b) = sinacosb + sinbcosa
    cos(a+b) = cosacosb - sinasinb

    The rest follows from that :-)
    Last edited by Moosemanuk; October 28th 2008 at 08:41 AM. Reason: trying Latex!
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  3. #3
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    Oct 2008
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    Oh I forgot to add: cos(a+b) = cosacosb - sinbsina Sorry!
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