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The PCHIP algorithm is written out in the SciPy API documentation:
https://docs.scipy.org/doc/scipy/reference/generated/scipy.interpolate.PchipInterpolator.html
In general, there is no guarantee that if you tabulate and
interpolate, the derivative matches the derivative of the underlying
I believe I know what is going on, but I don't understand why.
The line for the first derivative that failed to coincide with the
points in the plot for the cosine is actually the interpolated first
derivative scaled by the factor pi/180. When I multiply the interpolated
values for the first
