Jawabanmu

2014-03-07T17:54:58+07:00
Tan a = -8/15 = de/sa

mi= √(-8)² + (15)² = √64 + 225 =√289 = 17
jadi, cos a = sa/mi  = 15/17

1 5 1
2014-03-07T18:03:18+07:00
tan a = -8/15 = de/sa

mi= √(-8)² + (15)² = √64 + 225 =√289 = 17
jadi, cos a = sa/mi  = 15/17