Evaluate the integral by interpreting it in terms of areas.
the answer is
Where .. the heck did come from?
I was trying to do
and then as
then plugging into then solving for the limit. It came out to be a super complicated root problem so I look in the back to see if I'm in the right track.. and theres a in the answer...
I think I'm missing something here... how is this integral end up having a ?