Word Count : 117

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दिया हुआ अवकल समीकरण है (y''+6y'+9y=\dfrac{1}{x^3}e^{-3x}, ; x>0) सबसे पहले समजात समीकरण हल करते हैं (y''+6y'+9y=0) इसका सहायक समीकरण है (m^2+6m+9=0 \Rightarrow (m+3)^2=0) _____ __________ ________ _______ ____ _____ _______ ________ ______ ______ __________.
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