Homework Statement
Find d^2/dx^2 and both complex number forms for the complex number equation (1+icos(x))/(1-icos(y))[/B]
Homework Equations
1. z=a+bi
2. re^itheta
The Attempt at a Solution
I have multiplied both sides by 1+icosy and gotten as far as (1+icosx+icosy-cosxcosy)/(1+cos^2y) but...
I was asked to prove that any function u(z,t)=f(z-vt) is a solution of the wave equation
∂2u/ dt2= v2 · ∂2u/dz2
I know that v is constant and z and t are independent. I've tried looking at Lorentz law but I am getting nowhere fast. Please help!