Jawabanmu

2014-02-14T22:26:56+07:00
Pke phytagoras  \sqrt{-8^{2} } +  15^{2}  = 17
cos a = de/sa = 15/17
sec a  = 17/15
sin = de/mi = -8/17
sin a . cos a = -8/17 . 15/17 = -120/289 = 0,41