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Math Help - derive cos(alpha+beta) sin(alpha+beta)?

  1. #1
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    derive cos(alpha+beta) sin(alpha+beta)?

    Can someone please help me derive the cos(alpha+beta) sin(alpha+beta)? Preferably in simple language X(

    I have to be able to do this on a test tomorrow, please help me
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  2. #2
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    here's a link that may help ...

    Math Forum - Ask Dr. Math
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  3. #3
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    Thanks for the link but we're supposed to derive it using matrices.
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  4. #4
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    PlanetMath: addition and subtraction formulas for sine and cosine

    on one of the very back pages of googles. this is the same thing right?

    i'm goign to ask a really stupid question sorry but...what is this used for?
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