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[" In a "Delta ABC,2cos((A-C)/(2))=(a+c)...

[" In a "Delta ABC,2cos((A-C)/(2))=(a+c)/(sqrt(a^(2)+c^(2)-ac))," then "],[[" A) "B=(pi)/(3)," B) "B=C," C) "A,B,C" are in "A.P," D) "B+C=A]]

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