jika diketahui f(x) =3x+2/x-3 rumus fungsi f2 (x)=(f o f)(x) adalah

f o f (x) = [3(3x+2/ x- 3) + 2] / [(3x+2/ x- 3) -3]
[ (9x + 6 ) + (6x - 4) ] / ( x- 3) / [ (3x -2) - (9x+6)/ (x- 3) ]

[(15 x + 2) / x - 3)] / [(-6x-8)/(x - 3)]

maka,
fof (x) = 15x + 2 / - (6x + 8)