Let I=int(e^(x))/(e^(4x)+e^(2x)+1)dx, J=...

Let `I=int(e^(x))/(e^(4x)+e^(2x)+1)dx, J=int(e^(-x))/(e^(-4x)+e^(-2x)+1)dx`.
Then, for an arbitrary constant c, the value of `J-l` equals to

`1/2 log |(e^(4x)-e^(2x)+1)/(e^(4x)+e^(2x)+1)|+C`

`1/2 log |(e^(2x)+e^(x)+1)/(e^(2x)-e^(x)+1)|+C`

`1/2 log |(e^(2x)-e^(x)+1)/(e^(2x)+e^(x)+1)|+C`

`1/2 log |(e^(4x)+e^(2x)+1)/(e^(4x)-e^(2x)+1)|+C`

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