1 3. Interpolate f(x) on [-1,1] at n = 3,5,..., 21 points by 1+25x polynomials, plot the polynomials and f(r) on the same graph, and mark the interpolating points. = a) Use equally distributed points. b) Use the Chebyshev points xj = cos 1, j = 1,2,..., n. 2j-1 2n c) Use the Chebyshev points (2nd type) rj = cos-, j = 0, 1, 2,..., n. n Note: You may use the provided Matlab code or write your own code.