_cseries_to_zseries(c)
Convert a Chebyshev series to the equivalent z-series. The result is never an empty array. The dtype of the return is the same as that of the input. No checks are run on the arguments as this routine is for internal use.
Chebyshev coefficients, ordered from low to high
Odd length symmetric z-series, ordered from low to high.
Convert Chebyshev series to z-series.
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