Plane and spherical trigonometry - Loc
... theacute angles a? and y is obtuse, as in Fig. 28, the proof remains, word for ... Exercise III. 1. cos 60°. cotl°. sec 71° 50'. tan 7° 41'. sin 45°. tan 75 ...
... theacute angles a? and y is obtuse, as in Fig. 28, the proof remains, word for ... Exercise III. 1. cos 60°. cotl°. sec 71° 50'. tan 7° 41'. sin 45°. tan 75 ...