यदि π/2 < x < π है, तो cot-1[(√(1 + sin x) + √(1 - sin x)) / (√(1 + sin x) - √(1 - sin x))] किसके बराबर है?

The value of cos(sin-1(513)) is equal to:

The solution of the equation 3 tan-1(x) - 2 cot-1(x) = π2 in the first quadrant is ________.

If sin-1(1 - x) - 2sin-1(x) = π2, then find the value of x.