Wave Equation

Consider the following expression: $z = \sin(y+it)+\cos(y-it)$ where z, y, and t are variables, and $i=\sqrt{-1}$ is a complex number. The partial differential equation derived fro...

The solution at x = 1, t = 1 of the partial differential equation $\frac{\partial^2 u}{\partial x^2} = 25 \frac{\partial^2 u}{\partial t^2}$ subject to initial conditions of $u(0)...