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Mathematics 24 Online
OpenStudy (anonymous):

Let OA,OB,OC be three rays in space, and let rays OD,OE,OF bisect the angles AOB,BOC,COA, respectively. Prove that the three angles formed by the rays OD,OE,OF are either all acute, or all right, or all obtuse

OpenStudy (anonymous):

no...its related to vectors not trigno

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