Show that a nonzero polynomial function y = f(x) cannot sat- isfy the equation y" = -y. Use this to prove that neither f(x) = sin x nor f(x) = cos x is a polynomial. Can you think of another way to reach this conclusion by considering limits as x → 0?

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.5: Rational Functions
Problem 54E
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Show that a nonzero polynomial function y = f(x) cannot sat-
isfy the equation y" = -y. Use this to prove that neither f(x) = sin x nor
f(x) = cos x is a polynomial. Can you think of another way to reach this
conclusion by considering limits as x → 0?
Transcribed Image Text:Show that a nonzero polynomial function y = f(x) cannot sat- isfy the equation y" = -y. Use this to prove that neither f(x) = sin x nor f(x) = cos x is a polynomial. Can you think of another way to reach this conclusion by considering limits as x → 0?
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