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) About Me  (Show Source):
You can put this solution on YOUR website!
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If ABC is a right angular triangle then  cos%5E2%28A%29+%2B+cos%5E2%28B%29+%2B+cos%5E2%28C%29 = highlight%281%29.