Calculate the Fourier Coefficient for $\ x^2 sin(x)$

Question

I really need help. I want to calculate the Fourier Coefficient for the function defined by: $\phi(x) = \ x^2 sin(x)$
for: $\ x<0<4.81$
I have a problem with the first step.

1. FourierSinCoefficient[\[Phi][x], x, n, FourierParameters -> {0, 1}]

Can anyone give me a clue how to do it?