Here is some mathematical content
(
1
0
0
0
1
0
0
0
1
)
a
x
2
+
b
x
+
c
x
=
−
b
±
b
2
−
4
a
c
2
a
/////////////////// Double angle cosine
cos
(
A
+
B
)
=
cos
(
A
)
cos
(
B
)
−
sin
(
A
)
sin
(
B
)
∫
a
b
f
(
x
)
d
x
∑
k
=
1
n
k
=
1
+
2
+
⋯
+
n
=
n
(
n
+
1
)
2
∫
-
1
1
1
-
x
2
d
x
=
π
2
sinh
x
=
e
x
-
e
-
x
2
x
=
-
b
±
b
2
-
4
a
c
2
a
x
2
+
sinx
=
2
cos
4
x
σ
=
∑
(
x
-
x
¯
)
2
n