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CBSE XII
>>
Math
>>
Three Dimensional Geometry
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Q)
Prove that the lines
x
=
p
y
+
q
;
z
=
r
y
+
s
and
x
=
p
′
y
+
q
′
;
z
=
r
′
y
+
s
′
are perpendicular if
p
p
′
+
r
r
′
+
1
=
0.
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