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When talking sine waves, the first thing that comes to my mind would be the observe them in the frequency domain. Each of your curves can be described as: $$y(t) = a_0 + a_1 \cos(2 \pi f_1 t) + b_1 \sin(2 \pi f_1 t) + a_2 \cos(2 \pi f_2 t) + b_2 \sin(2 \pi f_2 t)$$ with $f_k$ denoting the frequencies of the two harmonics, and $a_k$ and $b_k$ the Fourier ...

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