I
f
x
+
i
y
=
1
+
i
1
-
i
;
p
r
o
v
e
t
h
a
t
x
2
+
y
2
=
1
.
Matching exercise
Match the items on the right to the items on the left.
Check
OK
Step 1
Step 2
Step 3
Step 4
Step 5