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If A+B+C=π Then prove that sin(B+2C)+sin(C+2A)+sin(A+2B)=4sin(B-C)/2sin(C-A)/2.sin(A-B)/2.?

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  • If A+B+C=π Then prove that sin(B+2C)+sin(C+2A)+sin(A+2B)=4sin(B-C)/2sin(C-A)/2.sin(A-B)/2.?


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