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किसी triangleABC में सिद्ध करे कि (...

किसी `triangleABC` में सिद्ध करे कि
`(b^(2) -c^(2))/(cosB + cosC) +(c^(2) -a^(2))/(cosC + cosA) + (a^(2) - b^(2))/(cosA + cosB) = 0`

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