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Q21E

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Fundamentals Of Differential Equations And Boundary Value Problems
Found in: Page 332
Fundamentals Of Differential Equations And Boundary Value Problems

Fundamentals Of Differential Equations And Boundary Value Problems

Book edition 9th
Author(s) R. Kent Nagle, Edward B. Saff, Arthur David Snider
Pages 616 pages
ISBN 9780321977069

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Short Answer

Solve the given initial value problem

y'''4y''+7y'6y=0y(0)=1y'(0)=0y''(0)=0

The solution is y(t)=e2t2etsin2t

See the step by step solution

Step by Step Solution

Step 1: Basic differentiation

The Sum rule says the derivative of a sum of functions is the sum of their derivatives. The Difference rule says the derivative of a difference of functions is the difference of their derivatives.

Step 2: Solving by basic differentiation:

We will do the following question on the basis of basic differentiation r34r2+7r6=0r34r2+7r6=(r2)(r22r+3)=0y(t)=c1e2t+c2etsin2t+c3etcos2ty'(t)=2c1e2t+c2etsin2t+2c2etcos2t+c3etcos2t2c3etsin2ty''(t)=4c1e2t+c2etsin2t+2c2etcos2t+2c2etcos2t2c2etsin2t+c3etcos2t2c3etsin2t2c3etsin2t2c3etcos2ty(0)=1y'(0)=0y''(0)=0y(t)=e2t2etsin2t

Hence, the final answer is:

y(t)=e2t2etsin2t

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