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Show that (a -b) x (a + b)-2 (a xb) |
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Answer» (a-b)x(a+b)= axa + axb - bxa - bxb you know axa = 0 and bxb = 0 you know -bxa=axb then (a-b)x(a+b) = axb +axb = 2(axb) |
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