Question
$\frac{{dy}}{{dx}} + y = {e^{ - x}},\,\,y(0) = 0$ का हल है
$y{e^x} = \int {{e^{ - x}}.{e^x}dx + c} $ ==> $y{e^x} = x + c$
चूँकि $y(0) = 0$, , $c = 0$
अत: अभीष्ट हल, $y{e^x} = x$ ==> $y = x{e^{ - x}}$
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