cot^(-1)(cot(-10))

A solution of the equation cot^(-1)2=cot^(-1)x+cot^(-1)(10-x)" where " 1 lt x lt 9 is :

A solution of the equation cot^(-1)2=cot^(-1)x+cot^(-1)(10-x)" where " 1 lt x lt 9 is : (a) 7 (b) 3 (c) 2 (d) 5

Find- cot^(-1)1+cot^(-1)2+cot^(-1)3

Prove that: cot^(-1)7+cot^(-1)18=cot^(-1)5 .

Prove that : cot^(-1)7+cot^(-1)8+cot^(-1)18=cot^(-1)3

Prove that : cot^(-1)7+cot^(-1)8+cot^(-1)18=cot^(-1)3

Prove that cot^(-1)7+cot^(-1)8+cot^(-1)18=cot^(-1)3

Prove that : cot^(-1)7+cot^(-1)8+cot^(-1)18=cot^(-1)3

The sum of the series cot^(-1)2+cot^(-1)8+cot^(-1)18+cot^(-1)32.........

2cot(cot^(-1)(3)+cot^(-1)(7)+cot^(-1)(13)+cot^(-1)(21)) has the value