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. y ′ − 2 y = φ ( x),<br />
<br />
⎧2,<br />
x<br />
φ ( x)<br />
= ⎨<br />
⎩0,<br />
x<br />
< 1<br />
> 1<br />
( −∞ , +∞ ) y = y(<br />
x),<br />
( −∞<br />
,1) (1,<br />
+∞<br />
y(0)<br />
= 0.<br />
) <br />
<br />
φ ( x)<br />
, y = y(<br />
x)<br />
x = 1<br />
y(<br />
x)<br />
.