Adding two sinusoids of the same frequency

Adding two sinusoids of the same frequency but with possibly different amplitudes and phases, produces another sinusoid at that frequency.

**Figure 10:** Adding two sinusoids of the same frequency.
$\scalebox{0.85}{\includegraphics{eps/sin_add.eps}}$

``Music 270a: Sinusoids'' by Tamara Smyth, Department of Music, University of California, San Diego (UCSD).