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Mathematics
Mathematics
Problem
If the given planes
a
x
+
b
y
+
c
z
+
d
=
0
ax + by + cz + d = 0
a
x
+
b
y
+
cz
+
d
=
0
and
a
′
x
+
b
′
y
+
c
′
z
+
d
′
=
0
a'x + b'y + c'z + d' = 0
a
′
x
+
b
′
y
+
c
′
z
+
d
′
=
0
be mutually perpendicular, then
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