The second derivative function is
,
.
The values of
and
.
Find the function
.

Apply integral on each side.
\





.
Substitute
.


Substitute the value of
.
.
Substitute
in
.
.
.
Apply integral on each side.
\


.
Substitute
.



Substitute
.


.
Substitute
in
.
.
The function
.
The function
.