4sinxsinxsin(x-y)+4sinysinzsin(y-z)+4sinzsinxsin(z-x)=sin(2x-2y)+sin(2y-2z)+sin(2z-2x)
4sinxsinxsin(x-y)+4sinysinzsin(y-z)+4sinzsinxsin(z-x)=sin(2x-2y)+sin(2y-2z)+sin(2z-2x)
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