diketahui f(x)=4/x,dan g(x)=1-3x tentukan: a.(fog) (x) b.(gof) (x)

A. (f°g)(x)=f(g(x))
=4/g(x)
=4/1-3x
B. (g°f)(x)=g(f(x))
=1-3(4/x)
=1-(12/x)
=(x/x)-(12x/x)
=-11x/x
=-11x