CBSE Class 12-science Answered
Explain:
Asked by | 15 Jun, 2009, 12:26: AM
Expert Answer
a X b = c X d (1)
and a X c = b X d (2)
(2)-(1) gives:
a X (c-b) = (b-c) X d
a X (c-b) - (b-c) X d =0
aX (c-b) - dX(c-b) =0
(a-d)X (c-b) =0
|a-d||b-c| sinΩ=0
as a d and b c.,sinΩ=0
Hence, Ω=0.Hence (a - d )|| (b - c )
Answered by | 15 Jun, 2009, 03:19: AM
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