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If int (e^x-e^-x)/(e^2x+e^-2x)dx =Alog|(...

If `int (e^x-e^-x)/(e^2x+e^-2x)dx =Alog|(e^x+e^-x+a)/(e^x+e^-x-a)|+c` then `(A,a)`is (A) `(-1/(2sqrt2),-sqrt2)` (B) `(-1/sqrt2,2sqrt2)` (C) `(1/sqrt2,-2sqrt2)` (D) `(1/(2sqrt2),-sqrt2)`

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