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Show that the following approximations have (a) f(x0)=h21[2f(x0)5f(x0+h)+4f(x0+2h)f(x0+3h)]+O(h2). (b) f(x0)=12h1[25f(x0)+48f(x0+h)36f(x0+2h)+16f(x0+3h) 3f(x0+4h)]+O(h4) Can you further get the coefficient of error term O(h4) in (b)? Why