Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_15314901_1 ( velocity_angle_η_in_i_radians VARCHAR, coordinate_velocity_v_dx_dt_in_units_of_c VARCHAR )

### 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 in i-radians?

### Accurate SQL ###

SELECT velocity_angle_η_in_i_radians FROM table_15314901_1 WHERE coordinate_velocity_v_dx_dt_in_units_of_c = "(e 2 − 1)/(e 2 + 1) ≅ 0.761"