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If a,b,c are sides of DeltaABC such that |{:(c,bcosB+cbeta,acosA+balpha+cgamma),(a,c""cosB+abeta,bcosA+calpha+agamma),(b,acosB+b""beta,c""cosA+aalpha+bgamma):}|=0 ("where" alpha,beta,gamma in R^+ and angleA,angleB,angleC ne pi//2) then DeltaABC is |
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