math 2 1
a
+
b
2
a
b
2
a
b
x
2
+
4
⁢
x
+
4
=
0
x
=
-
b
±
b
2
-
4
⁢
a
⁢
c
2
⁢
a
z
x
+
y
x
2
4
x
4
0
x
±
b
2
b
2
4
a
c
2
a
A
x
y
z
w
∫
1
t
ⅆ
x
x
x
1
t
1
x
x
1
t
1
x
∫
1
t
ⅆ
x
x
x
+
a
/
b