COMEDK Exam 2012 Solved Paper

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Question : 138 of 180

Marks: +1, -0

If y=tan−1(‌

1

1+x+x2

)+tan−1(‌

1

x2+3x+3

) +tan−1(‌

1

x2+5x+7

)+...+ upto n terms then, ‌

dy

dx

at x=0 and n=1 is equal to

‌
1
2
−‌
1
2
0
‌
1
3

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