I come across this problem. I need help to solve this problem

Integral ( (ax^3) / ((e^(bx)) - 1) dx

2. Originally Posted by Gupta
I come across this problem. I need help to solve this problem

Integral ( (ax^3) / ((e^(bx)) - 1) dx
For general values of a and b, it can't be done using a finite number of elementary functions. See below what happens when a = b = 1, for example. Perhaps it's meant to be a definite integral ....?

3. Originally Posted by mr fantastic
Perhaps it's meant to be a definite integral ....?
Pretty sure of it.

Mostly times I've seen people tryin' to compute (like if always would exist) an antiderivative for the function, but they don't realize the importance of the integration limits.