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यदि A+B+C=2pi हो तो सिद्ध कीजिए कि - c...

यदि `A+B+C=2pi` हो तो सिद्ध कीजिए कि -
`cos^(2)A+cos^(2)B+cos^(2)C-2cosAcosBcosC=1.`

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