Jawabanmu

2014-06-12T11:35:00+07:00
Sin² + cos² = 1
cos² = 1-1/3
cos² = 8/3
cos = √(8/3)
cos = 2/3 √6

:)
2014-06-12T12:15:29+07:00
Sin P= √3/3
sin = de/mi
de=√3
mi=3
sa =3²-(√3)²
sa = 9-3
sa=√6
cosP = sa/mi = √6/3