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[" 28."a sin(B-C)+b sin(C-A)+c sin(A-B)=...

[" 28."a sin(B-C)+b sin(C-A)+c sin(A-B)=0],[" 29."a^(3)sin(B-C)+b^(3)sin(C-A)+c^(3)sin(A-B)=0]

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