2. Consider the function f(x)=sin(x) on the interval [0,1]. Use theorem(3.3) to determine the step size h so that: a. linear Lagrange interpolation has an accuracy of 10°. b. quadratic Lagrange interpolation has an accuracy of 10°.

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2. Consider the function f(x)=sin(x) on the interval [0,1]. Use theorem(3.3) to determine the
step size h so that:
a. linear Lagrange interpolation has an accuracy of 10“.
b. quadratic Lagrange interpolation has an accuracy
of 10“.
c. cubic Lagrange interpolation has an accuracy of 10°.
Theorem (3.3): (Error Bounds for Lagrange Interpolation, Equally Spaced Nodes)
Assume that f(x) is defined on [a,b], which contains equally spaced nodes x=Xo+hk.
Additionally, assume that f(x) and derivatives of f (x), up to order N+1, are continuous and
bounded on the special subintervals [xo,X1], [Xo,X2], and [xo,X3], respectively; that is:
(3.13)
|F(N+1)(x)| < Mn+1 for xo sxs xN
for N=1,2,3. The error terms (3.13) corresponding to the cases N=1,2, and 3 have the following
useful bounds on their magnitude:
|E,(x)| <
h²M2
valid for x e [xo, X1],
(3.15)
|E2(x)| <
h³ M2
valid for x € [X,, Xz],
(3.16)
|E,(x)| < valid for x e [xo,X3],
24
(3.17)
Transcribed Image Text:2. Consider the function f(x)=sin(x) on the interval [0,1]. Use theorem(3.3) to determine the step size h so that: a. linear Lagrange interpolation has an accuracy of 10“. b. quadratic Lagrange interpolation has an accuracy of 10“. c. cubic Lagrange interpolation has an accuracy of 10°. Theorem (3.3): (Error Bounds for Lagrange Interpolation, Equally Spaced Nodes) Assume that f(x) is defined on [a,b], which contains equally spaced nodes x=Xo+hk. Additionally, assume that f(x) and derivatives of f (x), up to order N+1, are continuous and bounded on the special subintervals [xo,X1], [Xo,X2], and [xo,X3], respectively; that is: (3.13) |F(N+1)(x)| < Mn+1 for xo sxs xN for N=1,2,3. The error terms (3.13) corresponding to the cases N=1,2, and 3 have the following useful bounds on their magnitude: |E,(x)| < h²M2 valid for x e [xo, X1], (3.15) |E2(x)| < h³ M2 valid for x € [X,, Xz], (3.16) |E,(x)| < valid for x e [xo,X3], 24 (3.17)
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