Suppose that f is twice differentiable at a. (a) Prove that there exist a 0ħ € (0, 1) such that f(x + h) = f(x) + hf'(x + 0µh). (b) Use part (a) to prove that lim h→0 - - f(a+h)-f(a) – f'(a)h h² (c) Evaluate limħ→o Oh for f(x) = x². = =f" (a) lim 0h. h→0

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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3. Suppose that f is twice differentiable at a.
(a) Prove that there exist a ħ € (0, 1) such that ƒ(x + h) = f(x) + hf'(x + 0₂h).
(b) Use part (a) to prove that
lim
h→0
=
f(a+h) − f(a) — fƒ'(a)h
h²
(c) Evaluate limh-oh for f(x) = x².
=
f"(a) lim Oh.
h→0
Transcribed Image Text:3. Suppose that f is twice differentiable at a. (a) Prove that there exist a ħ € (0, 1) such that ƒ(x + h) = f(x) + hf'(x + 0₂h). (b) Use part (a) to prove that lim h→0 = f(a+h) − f(a) — fƒ'(a)h h² (c) Evaluate limh-oh for f(x) = x². = f"(a) lim Oh. h→0
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