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[" 39.If "A,B,C" are the angles of a tri...

[" 39.If "A,B,C" are the angles of a triangle such that "],[qquad [cot(A)/(2)=3tan(C)/(2)," then "sin A,sin B,sin C" are in "],[(1)" A.P."],[(3)" H.P."]]

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