Sine plots of increasing frequencies and amplitudes in the same subplot, with a legend showing which plot is which.

Illustrates the use of `options.OptsBase.add_legend`

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Function | vectors | Returns a list with X and `k*sin(k*X)` for k from 1 to
N, where X is a 1-D Numpy vector having 200 points from 0 to 4*pi. |