1.

Ifveca=hati-hatj,vecb=hati-hatj-4hatk,vecc=3hatj-hatkandvecd=2hati+5hatj+hatk, verify that (i)(vecaxxvecb)xx(veccxxvecd)=[veca,vecb,vecd]vecc-[veca,vecb,vecc]vecd(ii)(vecaxxvecb)xx(veccxxvecd)=[veca,vecc,vecd]vecb-[vecb,vecc,vecd]veca

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ANSWER : ` -24hati+24hatj-40hatk `


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