Hello, I would ask you how to write integrate formula.
I know this will work..
F(x)<-integrant (exp (x)/x^2) integrate(f(x), lower = 0, upper = Inf)
but what i want to is put
the formula is technically
F(x)<-9x^3*integrant (exp (x)/x^2)
but this doesn't work.
i appreciate your advice. im not good at math.