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(A¡ÁB)∙(C¡ÁD)=(A∙C)∙(B∙D)-(A∙D)∙(B∙C)

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(1) a∙(b¡Ác)=(a¡Áb)∙c
(2) a¡Áb=-b¡Áa
(3) a¡Á(b¡Ác)=(a∙c)b-(a∙b)c

(A¡ÁB)∙(C¡ÁD)=[(A¡ÁB)¡ÁC]∙D=-[C¡Á(A¡ÁB)]∙D=-[(C∙B)A-(C∙A)B]∙D=(A∙C)∙(B∙D)-(A∙D)∙(B∙C)
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