text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE table_15314901_1 (coordinate_velocity_v_dx_dt_in_units_of_c VARCHAR, velocity_angle_η_in_i_radians VARCHAR)
  ### Question:
  What is the coordinate velocity v dx/dt in units of c total number if the velocity angle η in i-radians is ln[2 + √5] ≅ 1.444?
  ### Answer:
  SELECT COUNT(coordinate_velocity_v_dx_dt_in_units_of_c) FROM table_15314901_1 WHERE velocity_angle_η_in_i_radians = "ln[2 + √5] ≅ 1.444"