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# 4) Evaluate numerically the df/dx at x=0 for three f(x) functions of sin(x), cos(x) and ex with the following FD schemes: a) first-order accurate forward b) central second-order accurate c) central fourth-order accurate Vary Ax between 0.1 and 0.001 and plot in the logarithmic scale the error as a function of Ax. You should produce three plots, one for

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