SOLUTION: if ABC is a right angular triangle then cos^2 A+cos^2 B+cos^2 C=?

SOLUTION: if ABC is a right angular triangle then cos^2 A+cos^2 B+cos^2 C=?

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Question 1004518: if ABC is a right angular triangle then cos^2 A+cos^2 B+cos^2 C=?
Answer by ikleyn(52805) (Show Source): You can put this solution on YOUR website!
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If ABC is a right angular triangle then = .
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