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how do you find the integral of (e^2x) / (1+(e^2x))^2 ?
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\[\int\limits \frac{e^{2 x}}{\left(1+e^{2 x}\right)^2} \, dx=-\frac{1}{2 \left(1+e^{2 x}\right)}+c \]
i got an extra (1+e^2x) on the denominator...
use u substitution. let u = 1+ e^2x ---> du= 2e^2xdx or 1/2du = e^2xdx
then you have the integral of 1/u^2
or 1/2 times that integral
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i used the formula for (u^n+1) / (n+1) + c .... did i use the formula correctly?
once you do the substitution then yes
oh! now i get what i did wrong....
int[u^(-2)] is -u^(-1)
thanks!
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no prob
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