APPENDIX 



APPENDIX C 



Functions of Angles greater than 90 

 ob the radius vector is always positive 

 FIRST QUADRANT 



-f ab 

 sin A =- ob sin is (+) 



.J^A 



cos A = -: cos is 



+ ob 



tan A = 4^ tan ii 



+ oa 



SECOND QUADRANT 



sin A = , -in 



+ 06 



oo 



COS A = , 008 18 I J 



+ 06 



tan A = tan is ( ) 



oo 



sin A = sin is ( ) 



+ 06 



THIRD QUADRANT 



sin 



cos is ( ) 

 tan A = tan is (-f) 



FOURTH QUADRANT 

 ab / \ 



-m .1 = - sin is ( ) 



+ 00 



1 = r . 1S (+) 



v v uiKi fi ^ ; 



V>sJ +< * 



5 



(Also see graphic representation of Trigonometric Functions) 



tan A - T-55 tan is (-) 



