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किसी त्रिभुज ABC में सिद्ध कीजिए कि- ...

किसी त्रिभुज ABC में सिद्ध कीजिए कि-
`c^(2)=(a-b)^(2)cos^(2)""(C)/(2)+(a+b)^(2)sin^(2)""(C)/(2)`

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