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7. Show that (A+B) x((A-B)=2(AxB) |
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Answer» (a+b)×(a-b)=a×a -b×b +b×a -a×b =0 -0 +2(b×a) =2(b×a) [wherea×ais equal to zero as the angle of a vector to itself is zero and-(a×b)=(b×a).] |
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