using matlab

3.2. The degree-n Chebyshev polynomial is defined by These satisfy To(x) = 1, Ti (x) = x, and the recursion relation Tn+1(x)=2x7,(x)-7,-1(x), n-l. Write a function chebeval (x,N) that evaluates all of the Chebyshev polynomials of degree less than or equal to N at all of the points in column vector x. The result should be an array of size length (x) by N+1