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Here is a graph of "well-being":

Consider three cycles of the human condition

The total well-being is a sum of the three cycles:

            y    =    A1 sin k1 x   +   A2 sin k2 x   +   A3 sin k3 x

where    k1 = 2p / 15     k2 = 2p / 10     k3 = 2p / 7.5

and A1, A2, A3 are amplitudes of the corresponding cycles.

Change the values of the amplitudes and observe the change in the graph.
In particular, compare with the results of your take-home quiz 7.