instruction: 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 in i-radians?
response: SELECT "Velocity angle \u03b7 in i-radians" FROM table_19991 WHERE "Coordinate velocity v dx/dt in units of c" = '(e 2 − 1)/(e 2 + 1) ≅ 0.761'