tan(x)
is an odd function of x , 
. Since the
circular domain is symmetric with respect to the y-axis this means
that
where
.
[Hint: Exploit the fact that D is symmetric with
respect to both axes.]
Solution:
The function tan(x)
is an odd function of x , . Since the
circular domain is symmetric with respect to the y-axis this means
that
.
The function 
is also an odd function. Since the circular domain is symmetric
with respect to the x-axis this means that 
.
No Maple Code for this problem.
Consequently
by: gm
A A A A M