The product of the mth and nth Chebyshev polynomials is the average of the (m + n)th and (m – n)th Chebyshev polynomials. Posted on 2021/11/16 by Carl Robitaille The product of the mth and nth Chebyshev polynomials is the average of the (m + n)th and (m – n)th Chebyshev polynomials.— Analysis Fact (@AnalysisFact) November 15, 2021