If tan -1 ( x + 1 ) + tan -1 ( x -1 ) = tan -1 ( 8/31 ), then x is equal to ________.
1/2
-1/2
1/4
1
α
Solution of the equation cot -1 x + sin -1 1/√5 = π/4 is ?
x =3
x = 1/√5
x = 0
None of these
0
-1
If , When x > 0, then x is equal to ______.
3
- 2/3
4 tan -1 1/5 - tan -1 1/239 is equal to _______.
π
π/2
π/3
π/4
If tan θ + tan ( π/3 + θ) + tan ( - π/3 + θ ) = a tan 3 θ, then a is equal to :
1/3
