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[" 30.In "/ABC" if the angle "A,B,C" are...

[" 30.In "/_ABC" if the angle "A,B,C" are in "A.P.],[" then "(a+c)/(sqrt(a^(2)-ac+c^(2)))=],[[" 1) "cos((A-C)/(2))," 2) "2cos((A-C)/(2))],[" 3) "2sin((A-C)/(2))," 4) "2cos((A+C)/(2))]]

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