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[" 2.If "int(0)^(x/2)(cot x)/(cot x+csc ...

[" 2.If "int_(0)^(x/2)(cot x)/(cot x+csc x)dx=m(pi+pi)" ,then "m-n" is equal to "],[[" (a) "-(1)/(2)," (b) "1," (c) "(1)/(2)," (d) "-1]]

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