Find an upper bound for the difference at x = 0.20 and x = 0.80 between...

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Find an upper bound for the difference at x = 0.20 and x = 0.80 between f (x) = e* and the polynomial that interpolates it at the points -1,-0.5, 0, 0.5, 1. Find an upper bound for the difference at x = 0.20 and x = 0.80 between f (x) = e* and the polynomial that interpolates it at the points -1,-0.5, 0, 0.5, 1.