Jawabanmu

2014-04-13T10:54:02+07:00
Ingat sisi segitiga istimewa 
3, 4,5
5,12,13
15,20,25
sinus = 20/25
         = 4/5
cos    =15/25
         = 3/5
tan     =20/15
          =4/3
2014-04-13T11:08:43+07:00
Segitiga istimewa 15 , 20 , 25
cos T = 15/25 = 3/5
sin T = 20/25 = 4/5
tan T = 20/15 =4/5