Trying to integrate (e^(2x))/((e^(2x)+1)^3). Its part of the 'using standard patterns to integrate' way of integrating but i just can't understand how it works. The answer is -1/4(e^(2x))/((e^(2x)+1)^2). Thanks
sorry, yeah thats the right answer, can you explain the last part sorry i didn't follow
You want to always split things up when working with U-Substitution.
Then you want to replace what you have with u's
so earlier we said lets make u=e^2x + 1 we then want to differentiate it so du/dx= 2e^2x we want to replace dx for du so take dx over du = 2e^2x dx.
Earlier we said the integral = e^2x (times by) 1/(e^2x + 1) dx Notice, by splitting we can get that e^2x dx. If we divide du by 2 it equals = e^2x dx This is what we want, so swap our x's for u's and bam, then integrate it!
You want to always split things up when working with U-Substitution.
Then you want to replace what you have with u's
so earlier we said lets make u=e^2x + 1 we then want to differentiate it so du/dx= 2e^2x we want to replace dx for du so take dx over du = 2e^2x dx.
Earlier we said the integral = e^2x (times by) 1/(e^2x + 1) dx Notice, by splitting we can get that e^2x dx. If we divide du by 2 it equals = e^2x dx This is what we want, so swap our x's for u's and bam, then integrate it!
thanks so much, can you integrate this as well? integrate (cos(x))/((cos(x)^2)^(3/2))