PP Presentation
e
ax
dx
ò
=
e
ax
a
l
e
-
l
t
dt
ò
=
l
e
-
l
t
-
l
=
-
e
-
l
t
=
e
-
l
¥
+
e
-
l
0
=
1
a
(
t
)
dt
t
=
0
¥
ò
=
1
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