Chebyshev polynomials Tn(x), n = 0, 1, ... of the first kind are of great importance in numerical analysis. They are defined recursively as follows
Tn(x) = 2x Tn-1(x) - Tn-2(x)
n = 2, 3, ..., T0(x) = 1, T1(x) = x.

Ex.
coeff=ChebT(3)
coeff=[4 0 -3 0];



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