int (3^(x))/(sqrt(9^(x)-1))dx =...

`int (3^(x))/(sqrt(9^(x)-1))dx =`

`(1)/(log 3) log|3^(x) + sqrt(9^(x)-1)|+c`

`(1)/(log 3) log |9^(x) + sqrt(9^(x)-1)|+c`

`(1)/(log 9) log|3^(x) + sqrt(9^(x)-1)|+c`

`(1)/(log 9) log |3^(x) - sqrt(9^(x)-1)|+c`

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