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Question

lf y=xx2+x3x4+., |x|<1, then x=

A
yy+1
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B
y1y
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C
y1y
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D
y+1y
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Solution

The correct option is A y1y
y=xx2+x3x4... ...(i)
xy=x2x3+x4... ...(ii) Since |x|<1
Adding i and ii we get
(1+x)y=x
1+xx=1y
using component-dividend method
1+xxx=1yy
1x=1yy
x=y1y for |x|<1

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