CREATE TABLE table_19991 ("Condition/Parameter" TEXT, "Coordinate velocity v dx/dt in units of c" TEXT, "Velocity angle \\u03b7 in i-radians" TEXT, "Proper velocity w dx/d\\u03c4 in units of c" TEXT, "Lorentz factor \\u03b3 dt/d\\u03c4 = E/mc 2" TEXT)

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?
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'
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'