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CBSE XII
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Math
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Q)
If
→
a
x
→
b
=
→
c
x
→
d
and
→
a
x
→
c
=
→
b
x
→
d
show that
→
a
−
→
d
is parallel to
→
b
−
→
c
where
→
a
≠
→
d
and
→
b
≠
→
c
.
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