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consider the parallelepiped spanned by three vectors a,b,c .show that
a.(b x c)=(a x b).c
note :the quantities |a.(b x c)|=|(a x b).c| is the volume of the parallelepiped with side "a,b,c "
the total surfacr area of the parallelepiped is surface area 2||a x b|| + 2||a x c||+2||b x c||​