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I cannot solve the following integral

integral from 0 to infinity of (x^3)/(exp(kx)-1) dx with k>0

as you may be able to guess, this integral is very famous one which can be used to deduce Stefan-Boltzman's radiation law

those of you who are experts may quickly recognize it and easily solve it

I've ever learnt the trick 4 years ago, now forget hehe

so I would be grateful if you could teach me that trick

any comments are welcome

regards