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#1 Help Me ! » Proof - Right Triangle » 2006-01-23 13:11:29

splintercell990
Replies: 1

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

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