Plot the function approximation and the error function as shown in Fig. 2.50a

and b (p. 144) for the arctan function for x ∈ [−1, 1] using the following coefficients:

(a) For N = 2 use f(x)=0.0000 + 0.8704x = (0 + 223x)/256.

(b) For N = 4 use f(x)=0.0000 + 0.9857x + 0.0000x2 − 0.2090x3 = (0 + 252x +

0x2 − 53x3)/256.

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