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Math Help - How do i add these formula

  1. #1
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    Red face How do i add these formula

    How do i add these equations to answer this question...

    2. Using compound angle formula show that

    Sin(A-B) + Sin(A+B) = 2Sin A Cos B




    Here are the equations...(I know i need to add them but how ?)

    [IMG]file:///C:/DOCUME%7E1/CHRISH%7E1/LOCALS%7E1/Temp/moz-screenshot-7.jpg[/IMG]
    Sin(A-B) = Sin A cos B - Sin B Cos A
    Sin(A+B) = Sin A Cos B + Sin B Cos A

    Last edited by duckegg911; March 30th 2009 at 10:46 AM. Reason: Spelling
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by duckegg911 View Post
    How do i add these equations to answer this question...

    2. Using compound angle formula show that

    Sin(A-B) + Sin(A+B) = 2Sin A Cos B



    Here are the equations...(I know i need to add them but how ?)

    [IMG]file:///C:/DOCUME%7E1/CHRISH%7E1/LOCALS%7E1/Temp/moz-screenshot-7.jpg[/IMG]
    Sin(A-B) = Sin A cos B - Sin B Cos A
    Sin(A+B) = Sin A Cos B + Sin B Cos A
    Hi duckegg911,

    This seems pretty straightforward to me.

    \sin(A+B) + \sin (A-B)=\sin A \cos B - \sin B \cos A + \sin A \cos B + \sin B \cos A=

    The \sin B \cos A terms cancel out.

    2 \sin A \cos B
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