Find the general solution of the differential equation y" + 2y' + 4y = e* sin 2x + æ?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Find the general solution of the differential equation.

Find the general solution of the differential equation
y" + 2y' + 4y = e" sin 2x + a?
Transcribed Image Text:Find the general solution of the differential equation y" + 2y' + 4y = e" sin 2x + a?
Expert Solution
Step 1

the given equation is 

y''+2y'+4=exsin2x+x2

Auxiliary equation corresponding to the equation is 

m2+2m+4=0m2+2m+1+3=0m+12=-3m=-1+3i , -1-3i

Since m has two imaginary roots, therefore, complementary function is 

yc=Acos-1+3ix+Bsin-1-3ix

A and B are constants.

Step 2

Let the perticular integral be 

yp=exsin2x+x2D2+2D+4                                Dddx=exsin2xD2+2D+4+x2D2+2D+4

Now, 

exsin2xD2+2D+4=ex1D+12+2D+1+4sin2x    eaxfxFD=eaxfxFD+a=ex 14D+3sin2x=-ex738cos2x+3sin2x

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