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"
Jika kecepatan koordinat v dx/dt dalam satuan C adalah (E 2-1)/(E 2 + 1) ≅ 0.761, berapakah sudut kecepatan η dalam I-Radians?
CREATE TABLE table_15314901_1 (velocity_angle_η_in_i_radians VARCHAR, coordinate_velocity_v_dx_dt_in_units_of_c VARCHAR)