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Prove that triangle ABC is a right angle triangle if and only if the following condition is met:
cos(A/2) * cos(B/2) * cos(C/2) - sin(A/2) * sin(B/2) * sin(C/2) = 1/2
As I have to go to school now I will post the proof tonight.
Last edited by krisper (2006-01-24 05:30:02)
Humankind's inherent sense of right and wrong cannot be biologically explained.
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