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Sn=cot^-1(3)+cot^-1(7)+cot^-1(13)+cot^-1...

`S_n=cot^-1(3)+cot^-1(7)+cot^-1(13)+cot^-1(21)+....+n`પદ સુધી હોય, તો ......

A

`S_10=tan^-1 (5/6)`

B

`S_6=tan^-1 (3/5)`

C

`S_oo= pi/4`

D

`S_20=cot^-1(11/10)`

Text Solution

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