How do you find the indefinite integral of #int (3^(2x))/(1+3^(2x))#?
Do a u substitution. Please see the explanation.
The first term of the derivative is 0 but the second term requires logarithmic differentiation:
Substituting this into the equation for
Writing this so that we can substitute into the integral:
Substituting this and u into the integral:
Reverse the substitution for u: