A solution of the eqution tan^-1 (1 + x) + tan^-1 (1 - x) = π/2 is 

The principal of value of sin^-1(sin 3π/4) is 

What is the value of sin^-1 (sin 2π/3)?

The value of sin(cot^-1x) is 

3 tan^-1 a is equal to 

Sin (sin^-1 1/2 + cos^-1 1/2) equals 

If tan^-12, tan^-13 are two angles of a triangle, then the third angle is 

Cost^-1(1/2) + 2 sin^-1(1/2) is equal 

If sec^-1 (1/x) + 2 sin^-1(1) = π, then x equals 

If sin^-1x = π/5, then cos^-1x equals