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TRAPEZOIDAL METHOD: ERROR FORMULA

TRAPEZOIDAL METHOD: ERROR FORMULAT heoremAssumef(x) twice continuously differentiable on theinterval [a,b]. ThenETn(f) := baf(x)dx Tn(f) = h2(b a)12f (cn)for somecnin the interval [a,b].Later we will say something about the proof of this result, as itleads to some other useful formulas for the above FORMULA says that the ERROR decreases in a manner thatis roughly proportional toh2. Thus doublingn(and halvingh)should cause the ERROR to decrease by a factor of approximately is what we observed with some past examples from thepreceding evaluatingI= 20dx1 +x2using the TRAPEZOIDAL methodTn(f). Let us bound the errorETn(f) = h2(b a)12f (cn)Here,b a= 2. We bound|f (cn)|by max0 x 2|f (x)|.

The corrected trapezoidal rule is illustrated in the following table. n I T n Ratio I CT n Ratio 2 5.319 3.552E 1 4 1.266 4.20 2.474E 2 14.4 8 3.118E 1 4.06 1.583E 3 15.6

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