Step 1:
\The functions are
and
.
Find inverse function of
.

Change
to
.
.Interchange
and
.
.
Solve for
.
.
Change
to
.
.
Step 2:
\Find inverse function of
.
.
Change
to
.
.
Interchange
and
.
.
Solve for
.

Change
to
.
.
Step 3:
\Find
.

Substitute
in
.

Substitute
in
.

.
Solution:
\
.