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Math Help - Simple fundamental identity problem

  1. #1
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    Simple fundamental identity problem

    I just have a pretty simple question, if someone could show me how it's done that would be great!

    Complete the fundamental identity:
    cos(w-z) using Angle Difference which is cos( θ- φ) = cosθcos φ + sinθsin φ
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  2. #2
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    Quote Originally Posted by alexcross View Post
    I just have a pretty simple question, if someone could show me how it's done that would be great!

    Complete the fundamental identity:
    cos(w-z) using Angle Difference which is cos( θ- φ) = cosθcos φ + sinθsin φ
    (cosw)(cosz)+(sinw)(sinz)
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    So is this as far as I can go in the problem?
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  4. #4
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    Yes, unless you have more special info about the variables in question.
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