Jawabanmu

2014-04-10T16:03:29+07:00
Sin a = 1/3
cos c = 1/3
cos a = 2,82/3
sin c = 2,82/3

(sin a . cos c)+(cos a . sin c)
(1/3 . 1/3) + (0,94 . 0,94)
1/9 + 0,8836 = 0,9947