Toronto Math Forum
APM3462020S => APM346Lectures and Home Assignments => Chapter 4 => Topic started by: Yan Zhou on March 04, 2020, 02:45:36 PM

The solutions to equation (11) should be $k_{1,2} = \pm \frac{\pi n}{l}i$. There is a missing sign of $\pm$.
In the second term of equation (13), $B_{n}sin(\frac{c\pi nt}{l})$ has an extra letter A.

You seem to have a different texbook than posted