Jawabanmu

Jawaban paling cerdas!
2014-05-29T11:01:19+07:00
Tan C = c/a = 3/7
maka,
b = akar (a^2 + c^2)
   = akar (7^2 + 3^2)
   = akar (49+9)
   = akar 58
   = 2 akar 19

jadi
cos C = a/b = 7/2 akar 19
                  = 7 akar 19 / 38