The Geometry relation 0=B Bt 6=B6 6=B6 1=元 1=元 Ab= BA A0=B4 tan xo=o tan x tan no =o tan xThe Geometry relation:                tan 1 tan 0 0 0 0 0 0 = = = = = = A A                tan 1 tan 0 0 0 0 0 0 = = = = = = A A