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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- March 23rd 2009, 11:24 PMmanyarrowsDeriving 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.

- March 24th 2009, 09:32 AMmasters
Hi manyarrows,

See Section 1.5 here.