# [SOLVED]Fourier coefficient

#### dwsmith

##### Well-known member
$$u_y(x,\pi) = \frac{x}{\pi} + \sum_{n = 1}^{\infty}nB_n\sin xn\cosh\pi n = 0.$$
How can I solve for $A_n$ here?

#### Sudharaka

##### Well-known member
MHB Math Helper
$$u_y(x,\pi) = \frac{x}{\pi} + \sum_{n = 1}^{\infty}nB_n\sin xn\cosh\pi n = 0.$$
How can I solve for $A_n$ here?
Hi dwsmith,

You you mean $$B_n$$ ? There is no $$A_n$$ in the equation.

Kind Regards,
Sudharaka.