The truncation error for S4 is 4.6875
Truncation error is defined as the difference between the true (analytical) derivative of a function and its derivative obtained by numerical approximation.
In the given Truncation error formula put n= 4
On substitution n value from 1 to 4
5/16 +5/8 + 5/4 + 5/2 = 4.6875
Thus the truncation error for S4 is 4.6875.
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