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Math Help - Proving equation for angle in a triangle

  1. #1
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    Proving equation for angle in a triangle




    In the diagram above, D divides BC in the ratio μ:γ. Prove that
    (μ+γ) cot θ = μ cot α- γ cot β

    I need some guidance to solve this question.
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  2. #2
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    What diagram?
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