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Mathematics
Problem
If
∣
a
b
−
c
c
+
b
a
+
c
b
c
−
a
a
−
b
a
+
b
c
∣
=
0
\begin{vmatrix} a & b-c & c+b \\ a+c & b & c-a \\ a-b & a+b & c \end{vmatrix} = 0
a
a
+
c
a
−
b
b
−
c
b
a
+
b
c
+
b
c
−
a
c
=
0
, the line
a
x
+
b
y
+
c
=
0
ax + by + c = 0
a
x
+
b
y
+
c
=
0
passes through the fixed point which is a.
(
1
,
2
)
(1, 2)
(
1
,
2
)
b.
(
1
,
1
)
(1, 1)
(
1
,
1
)
c.
(
−
2
,
1
)
(-2, 1)
(
−
2
,
1
)
d.
(
1
,
0
)
(1, 0)
(
1
,
0
)
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