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Mathematics
Problem
The solution of
d
y
d
x
+
y
=
e
−
x
\frac{dy}{dx} + y = e^{-x}
d
x
d
y
+
y
=
e
−
x
,
y
(
0
)
=
0
y(0)=0
y
(
0
)
=
0
is
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