1. The problem statement, all variables and given/known data Using expansion of sin and cos functions, show that the resultant of adding the following two waves: a) E1 = E01*sin(wt-k(x+Δx)) b) E2 = E01*sin(wt-kx) Gives: E = 2E01*cos((1/2)kΔx)*sin[wt-k(x+Δx/2)] 2. Relevant equations N/A 3. The attempt at a solution I don't know how to sum the two waves using superposition. I don't understand how to get to the final solution. Please help.