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यदि tan(sum(r=1)^(n) tan^(-1)((2r-1)/((r...

यदि `tan(sum_(r=1)^(n) tan^(-1)((2r-1)/((r^(2)+r+1)(r^(2)-r+1)-2r^(3)))=961` है, तो n का मान है

A

31

B

30

C

60

D

61

लिखित उत्तर

Verified by Experts

The correct Answer is:
A
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