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A+B=C=>cos^2A+cos^2B+cos^2C-2cosA cosBco...

` A+B=C=>cos^2A+cos^2B+cos^2C-2cosA cosBcosC=`

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If A+B+C=180^@ , then prove that cos^2 A + cos^2 B +cos^2 C=1-2cosA cosB cosC .

If A+B+C=180^0 , prove that : cos^2 A + cos^2 B + cos^2 C + 2cosA cosB cosC=1 .

If A+B+C=0 , Prove : cos^2 A + cos^2 B +cos^2 C=1+2cosA cosB cosC .

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cos^2 A + cos^2 B +cos^2 C=1+2cosA cosB cosC .

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If A+B+C= 360^(@) ,prove that: 1-cos^(2)A-cos^(2)B-cos^(2)C+2cosA cos B cos C=0

If A+B+C=180^@ , then prove that cos2A + cos2B +cos2C=-1-4cosA cosB cosC .

If A+B+C=180, prove that cos^(2)A+cos^(2)B+cos^(2)C=1-2cos A cos B cos C