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Problem
Problem
If
C
C
C
satisfies the equation
lim
x
→
∞
(
x
+
c
x
−
c
)
x
=
4
\lim_{x \to \infty} \left( \frac{x+c}{x-c} \right)^x = 4
lim
x
→
∞
(
x
−
c
x
+
c
)
x
=
4
, then
[
e
c
2
]
\left[ \frac{e^c}{2} \right]
[
2
e
c
]
is .....
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