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Mathematics 7 Online
OpenStudy (anonymous):

Hello, I need help to prove that cos^2(a)+cos^2(b)+cos^2(c)=1

Directrix (directrix):

What, if anything, is given about the relationship of angles A, B, and C? Is there a diagram?

OpenStudy (anonymous):

Supponsedly that's about the direction cosines of a vector.

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