Jawabanmu

2014-03-18T17:28:31+07:00
Cos a = akar40 / 7. sin a = 3 / akar40 cos a - sin a = 19akar 10 / 20
2014-03-18T17:37:44+07:00
Cos a = akar 40/ 7
tan a = akar 3/ akar 40
akar 40/7 - 3/akar 40 = 19/7 akar 40
 dirasionalkan saja ....^-^