[" In "MBC," if "A+C=2B," then "(a+c)/(s...

[" In "MBC," if "A+C=2B," then "(a+c)/(sqrt(a^(2)-ac+c^(2)))=],[[" A) "2cos((A-C)/(2))," B) "sin((A+C)/(2))," C) "2tan((A+B)/(2))," D) "tan((A+B)/(2))]]

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