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Math Help - Deriving addition identities geometrically

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    Deriving addition identities geometrically

    I am trying to figure out how to derive the addition formulas using triangles. his is what I came up with so far. Is this on the right track? How do I finish it? I am trying to attach a file, don't know if it will work.
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    A riddle wrapped in an enigma
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    Quote Originally Posted by manyarrows View Post
    I am trying to figure out how to derive the addition formulas using triangles. his is what I came up with so far. Is this on the right track? How do I finish it? I am trying to attach a file, don't know if it will work.
    Hi manyarrows,

    See Section 1.5 here.
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