I think the answer is 13.5 square units.
can’t see the whole question
The cylinder is symmetric across the plane

, so we need only consider half of the cut-out region.
This region can be parameterized by

with

and

. Then the area of this half is given by the surface integral



Doubling this gives a total area of 72.
Answer:
D.
Step-by-step explanation:
(m^2- 4n)(m^4+4m^2n+16n^2)