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Question

Prove that:-
¯d.[¯a×{¯b×(¯cׯd)}]=(¯b.¯d)[¯a¯c¯d]

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Solution

d.[a×{b×(c×d)}]=d.[a×((b×d)c(b×c)d)]=d.[(b×d)(a×c)(b×c)(a×d)]=(b×d)[acd]Henceproved.

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