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Question Number 91371 by jagoll last updated on 30/Apr/20
what is the particular   integral (D^2 +D+1)y=e^x sin x
whatistheparticularintegral(D2+D+1)y=exsinx
Commented by jagoll last updated on 30/Apr/20
y_p  = ((e^x sin x)/(D^2 +D+1))  y_p  = ((xe^x sin x)/(2D+1)) = −[ (2D−1)xe^x sin x ]  = −2[e^x sin x+xe^x sin x+xe^x cos x]  +xe^x sin x  = −2e^x sin x−2xe^x sin x−2xe^x cos x  + xe^x cos x  = −2e^x sin x−2xe^x sin x−xe^x cos x  = e^x  (−2sin x−2xsin x−xcos x)
yp=exsinxD2+D+1yp=xexsinx2D+1=[(2D1)xexsinx]=2[exsinx+xexsinx+xexcosx]+xexsinx=2exsinx2xexsinx2xexcosx+xexcosx=2exsinx2xexsinxxexcosx=ex(2sinx2xsinxxcosx)

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