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Math Help - trig problem

  1. #1
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    trig problem

    I cant get this.

    Express cos(7x) + cos(3x) as a product of trigonometric functions.
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  2. #2
    Super Member TheChaz's Avatar
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    Re: trig problem

    Quote Originally Posted by dazedandmathfused View Post
    I cant get this.

    Express cos(7x) + cos(3x) as a product of trigonometric functions.
    List of trigonometric identities - Wikipedia, the free encyclopedia
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  3. #3
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    Re: trig problem

    Okay but i cant get the answer i dont know how
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  4. #4
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    Re: trig problem

    Write cos(7x) + cos(3x) as cos(5x+2x) + cos(5x-2x). Use angle addition & subtraction identities for cosine.
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