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Byju's Answer
Standard XII
Mathematics
Theorems for Continuity
If x=ey+ey+ey...
Question
If
x
=
e
y
+
e
y
+
e
y
+
.
.
.
∞
,then
d
y
d
x
is
A
1
x
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B
1
−
x
x
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C
x
1
+
x
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D
N
o
n
e
o
f
t
h
e
s
e
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Solution
The correct option is
B
1
−
x
x
x
=
e
y
+
x
⇒
l
o
g
e
x
=
y
+
x
∴
1
x
=
d
y
d
x
+
1
⇒
d
y
d
x
=
1
−
x
x
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0
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Q.
If x =
e
y
+
e
y
+
e
y
+
e
y
+
.
.
.
∞
, then
d
y
d
x
is