Question: If the coordinate velocity v dx/dt in units of c is (e 2 − 1)/(e 2 + 1) ≅ 0.761, what is the velocity angle η in i-radians?
SQL: SELECT Velocity angle η in i-radians FROM table WHERE Coordinate velocity v dx/dt in units of c = (e 2 − 1)/(e 2 + 1) ≅ 0.761