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If a,b,and c are sides of Delta ABC such that |{:(c,bcosB+alphabeta,acosA+balpha+cgamma),(a,c cosB+a beta,b cosA+c alpha+agamma),(b,acosB+b beta,c cosA+aalpha+bgamma):}| =0 (where alpha ,beta,gamma,in R ^(+)"and" angleA,angleB,angleCne(pi)/(2)), Delta ABC is

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an isosceles
an EQUILATERAL
can 't say
None of these

Answer :B


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