HP 48gII - Manual (Page 518)

Page 16-40
In this case, the period T, is 4. Make sure to change the value of variable
@@@T@@@ to 4 (use: 4 K @@@T@@ `). Function g(X) can be defined in the
calculator by using
DEFINE(‘g(X) = IFTE((X>1) AND (X<3),1,0)’)
The function plotted as follows (horizontal range: 0 to 4, vertical range:0 to
1.2 ):
Using a procedure similar to that of the triangular shape in example 2, above,
you can find that
5 . 0 1
1
3
1
0
= 



⋅ ⋅ = ∫ dX
T
c
,
and
We can simplify this expression by using e
in π /2 = i n and e 3in π /2 = (-i) n to get: