KCET 2012 Math Solved Paper

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Question : 14 of 60

Marks: +1, -0

If y=elog9[1+x+x2+...] and |x|<1, then ‌

dy

dx

=

1
(1+x)2
1
(1−x)2
−
1
(1+x)2
−
1
(1−x)2

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