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Math Help - Law of Cosines

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    Law of Cosines

    Use the Law of Cosines to prove the identity

    (cosA/a) + (cosB/b) + (cosY/c) =
    (a^2 + b^2 + c^2)/(2abc
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    Quote Originally Posted by magentarita View Post
    Use the Law of Cosines
    yes ! That's exactly what you have to do !
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