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Math Help - Cosine

  1. #1
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    Question Cosine

    If cosθ = 0.6, then cos(θ + ) = ?

    How would I start this problem?
    Thanks for your help!
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  2. #2
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    Quote Originally Posted by live_laugh_luv27 View Post
    If cosθ = 0.6, then cos(θ + ) = ?

    How would I start this problem?
    Thanks for your help!
     cos(\theta+\pi) = -cos(\theta)
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