CBSE Class 12-science Answered
if p,q,r denote vectore b x c, c x a,a x b respectively then show that
Asked by | 20 Feb, 2009, 05:32: PM
Expert Answer
A x (B xC ) = B (A.C) - C(A.B)
q x r = (c x a) x (a x b)
= a( (c x a) .b ) - b ( (c x a) .a ) (c x a will be perpendicular to a so (c x a) .a = 0)
=a( (c x a) .b )
now a x (q x r ) = a x a ( (c x a) .b ) = 0 since a x a = 0
similarly we can prove for others.
Answered by | 20 Feb, 2009, 10:07: PM
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