Originally Posted by

**sajoson** I want to open the brackets of this problem

-(1/2)((x/2)+(x^2/4)+(x^3/12)+.................)^2+(1/3)((x/2)+(x^2/4)+..............)^3

The answer to this should be -(x^2/8)-(x^3/8)-(x^4/32)-(x^4/24)-........+(x^3/24)+(x^4/16)+..........

This is a part of a expansion problem whose original question is log(1+e^x)

I know we have to use the binomial theorem but dont know how.

Because in (a+b)^n there are only two terms but in the first bracket there are three terms.

Please help me with this as i have my exams on this within few days. Thank You.