a
2
+
b
2
=
c
2
0
1
0
0
0
1
1
0
0
x
2
+
y
x
2
y
x^{2} + y
2
x
+
y
=
-
5
x
-
2
y
=
1
Theorem of Pythagoras
/* comment here */
test
x
2
1
2
r
−
1
\sqrt{2r - 1}