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Hajja's Rational Cosine (Posted on 2005-03-02) Difficulty: 2 of 5
Prove that the angles of a triangle all have rational cosines if and only if the triangle is similar to one with rational sides.

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  Subject Author Date
Other HalfRichard2005-03-02 22:59:26
Hints/TipsHalf an answerCharlie2005-03-02 16:22:03
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