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Math Help - Compound Angle Formula (check if this is right)

  1. #1
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    Compound Angle Formula (check if this is right)

    Use the compound forumla to express each of the following as a single trigonometric function.

    cos x cos x - sin x sin x
    Would this just be cos (a + b)?
    =cos2x

    and

    sin 5a cos 2a + cos 5a sin 2a
    This would be sin (a + b)?
    =sin7a

    Appreciate the help.
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by peekay View Post
    Use the compound forumla to express each of the following as a single trigonometric function.

    cos x cos x - sin x sin x
    Would this just be cos (a + b)?
    =cos2x

    and

    sin 5a cos 2a + cos 5a sin 2a
    This would be sin (a + b)?
    =sin7a

    Appreciate the help.
    Both of your answers are correct!
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  3. #3
    Master Of Puppets
    pickslides's Avatar
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    I agree with your solutions
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  4. #4
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    Quote Originally Posted by pickslides View Post
    I agree with your solutions
    I agree with your awesomeness.

    Thanks guys!
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