Q. 124.5( 12 Votes )

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Answer :

Let the vectors be and . Given that and

Since ,




12 = 12 + 12 + 2(1)(1) cos θ

⇒1+1+2cosθ =1

or 2cosθ=-1







=√3


OR


If , and , then we define as



Given that , and



=2(-4-1)-3(2+3) +1(1-6)


=-30

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