KCET 2012 Math Solved Paper

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Question : 44 of 60
 
Marks: +1, -0
If y=tan−1(
1
1+x+x2
)
+tan−1(
1
x2+2x+3
)
+tan−1(
1
x2+5x+7
)
+.......
n terms, then y'(0) is
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