CLEO Help how to find the angle between 2 points along the y axis

[xAmUser]

how to find the angle between 2 points along the y axis
(this does not work):
:getYAngleBetweenPoints_ULKXK
0509: 6@ = distance_between_XY 0@ 1@ and_XY 3@ 4@
0063: 2@ -= 5@
0604: get_Z_angle_for_point 6@ 2@ store_to 7@
0AF8: samp add_message_to_chat "%f" color 0xffffff 0@
0AB2: ret 1 7@