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Math Help - Express as a trigonometric function of one angle

  1. #1
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    Express as a trigonometric function of one angle

    cos13cos50 - sin13sin50

    the integers are in degrees. not radians.
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  2. #2
    MHF Contributor harish21's Avatar
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    Quote Originally Posted by GUNSLINGAZ View Post
    cos13cos50 - sin13sin50

    the integers are in degrees. not radians.

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

    Can you express your question in terms of \cos(A+B) now?
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  3. #3
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    oh yeah! thanks! i can do it now.
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