Thank you mr fantastic and matheagle for reply.
To be honest I have ever never met what called by narmalization constant.
I googled and found in Wikipedia what called pdf (prabability density function). I do not know here it is the same or not.
What I have for my problem:
f(u)=ku(1-u)(u-a), 0<a<1, u [0,1] and max f(u)=1 on [0,1].
I tried to compute the to find the value of k. Is it true?
When I integrate from to ?
Thanks a lot.