misal diketahui nilai 6sinx+12cosx=7 dan 6sinx-3cosx = 2 .Nilai 2tanx =

6 sin x + 12 cos x = 7
6 sin x - 3 cos x = 2
------------------------------ (-)
15 cos x = 5
cos x = 5/15
cos x = 1/3

6 sin x - 3 cos x = 2
6 sin x - 3 . 1/3 = 2
6 sin x - 1 = 2
6 sin x = 2 + 1
sin x = 3/6
sin x = 1/2

2 tan x
= 2 . sin x/cos x
= 2 × 1/2 × 3/1
= 3