/ N //."/,/ < | 



16. Other important formulas. If 0, an. I f ar* ajiy two 

 jii.in- iogltii th. -ii 



< t 0, ) = Hill 0, COH 0, CO* 0, Kill r 



oos(0 | t )-cos0 1 oos0 J * i0 r 



a 



^*' )i 



t 



If in any plane angle, then 



; =. 

 oo820-oo l 0-Hin^-l -JM.,^-2c<^0- 1 



J0= 



1 -tan0 



I 



ta fl-^/l -^fl^l CQg^p, * n 



2M + co80 sin0 *l+cos0 



If a, ft, and c are the sides of a respectively 



.site the angles A, J> and if A is tin- area of this 



If. llirll 



1, ami A: 



EXERCISES 



xprtws in radiana the angles : 

 tXJ"; 136; -258; | rt angle; 101<X10"; 882'; 



2. Kxpren in degrees, niinutm. and second*, the angles : 



ffl-,mrflra .- -.f 



3 Fitul the Talaes of the other trigonoroetHe funcHonm ghren : 



tantf = 3; (2) aec* = -V5; (8) m*-- 1 : (I) 

 cot^ = |; and (U) cac M = - 2. v * 



