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# numpy.polynomial.chebyshev.Chebyshev.trim

`Chebyshev.``trim`(tol=0)

  Remove trailing coefficients

  Remove trailing coefficients until a coefficient is reached whose absolute value greater than tol or the beginning of the series is reached. If all the coefficients would be removed the series is set to `[0]`. A new series instance is returned with the new coefficients. The current instance remains unchanged.

  Parameters: | tol : non-negative number. All trailing coefficients less than tol will be removed.
  Returns: | new_series : series Contains the new set of coefficients.