Constructive and Destructive Interference

Just a simple animation of waves going in and out of phase leading to constructive and destructive interference. I'm still writing the article, so I'm waiting to upload the code until I'm finished. The exact formula for the amplitude of two waves with equal amplitude A with a phase difference of δ is given by 2 A | cos(δ / 2) |, where δ is measured in radians. You can find this result with various trig identities or by factoring some complex exponentials.