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[" In "Delta ABC" ,the value of "(cot(A)...

[" In "Delta ABC" ,the value of "(cot(A)/(2)cot(B)/(2)-1)/(cot(A)/(2)cot(B)/(2))" is "],[(a)/(a+b+c)" 2) "(2c)/(a+b+c)" 3) "(2a)/(a+b+c)4" ) "(2b)/(a+b+c)]

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