tan-1[(√(1+x2) + √(1-x2)) / (√(1+x2) - √(1-x2))] का सरलीकृत मान ज्ञात कीजिए, जहाँ 0 < |x| < 1/√2 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.