mohon bantuannya makasih :)

1a). f^-1(x) = (x - 5)/3
1b). f^-1(x) = (2x + 2)/(5 - 5x)
1c). f^-1(x) = x^2 + 5

2). (f o g)^-1(x) = ....
f[g(x)] = -15x + 1
f[g(x)]^-1 = (1 - x)/15

No. 3 sama caranya seperti no.2