136 



U. S. COAST AND GEODETIC SURVEY. 



tan <j — 



sin(e+<.)=!HLf^25i: 



cos X 



i^m — 



1 + 2 



^ s COS ^ — r* 



TT . 



smf 



sec ^ 



X. _ y sm ^ 



^ X cos (p cos l/' 



*See p. 128. 



