Mathematics, 05.04.2021 19:20 ibin246

C²cos²B+b²cos²C+bccos(B-C)=1/2(a²+b ²+c²)

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C²cos²B+b²cos²C+bccos(B-C)=1/2(a²+b ²+c²)​

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C²cos²B+b²cos²C+bccos(B-C)=1/2(a²+b ²+c²)