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Homework Statement
Equation of a wave is a = a°sin(ωt - kx + φ)
where φ is the phase of a wave. if 2 waves with phases φ1 and φ2 interfere, show how the intensity I =a² varies as a function of the phase difference φ1 - φ2. Use one of the trigonometric double angle forumula or otherwise to obtain your result.
Homework Equations
The double angle formulas
The Attempt at a Solution
Well am I supposed to map I =a² onto the equation?
If so then the only double angle formula is cos(2x) = cos²(x) - sin²(x)
But I get a really stupid answer when I square the wave equation..
What do I do?