Mathematics, 20.01.2022 02:50 jm00120

If A+B+C=180 prove that cosB+cosC-cosA=4sinA/2×cosB/2×cosC/ 2-1

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If A+B+C=180 prove that cosB+cosC-cosA=4sinA/2×cosB/2×cosC/ 2-1...

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