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Unformatted text preview: Solutions 1.1Page 9 Problem 1 Verify by substitution that each given function is a solution of the given differential equation. Primes denote derivatives with respect to x. 2 = + ′ y y ; x e y 2 3 − = Eq.1: Eq.2: y 3 = 2 = + ′ y y x e 2 − Differentiating Eq.2 with respect to x yields: a) x e y 2 6 − − = ′ From Eq.2, b) 2 x e y 2 6 − = Substituting a and b into Eq.1 yields: 6 6 2 2 = + − − − x x e e Problem 6 Verify by substitution that each given function is a solution of the given differential equation. Primes denote derivatives with respect to x. 4 4 = + ′ + ′ ′ y y y ; x x xe y e y 2 2 2 1 , − − = = The problem will first be verified for , and then the problem will be verified again for . 1 y 2 y With : 1 y Eq.1: Eq.2: e y = 4 4 = + ′ + ′ ′ y y y x 2 1 − Differentiating Eq.2 with respect to x and multiplying by 4 yields: a) x e y 2 1 8 4 − − = ′ Differentiating again with respect to x yields: b) x e y 2 1 4 − = ″ Multiplying Eq.2 by 4 yields: Multiplying Eq....
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This note was uploaded on 06/06/2011 for the course EGM 3311 taught by Professor Haftka during the Spring '11 term at University of Florida.
 Spring '11
 HAFTKA

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