KCET 2009 Math Solved Paper

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Question : 19 of 61

Marks: +1, -0

cot−1(2⋅12)+cot−1(2⋅22)+cot−1(2⋅32)+.....‌ up to ‌∞=

‌
π
5
‌
π
4
‌
π
3
‌
π
2

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