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CBSE Class 12 Math 2019 Delhi Set 1 Solved Paper

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Question : 10 of 29
Marks: +1, -0
If the sum of two unit vectors is a unit vector, prove that the magnitude of their difference is 3\sqrt{3}.
OR
If a⃗=2i^+3j^+k^,b⃗=i^−2j^+k^\vec{a}=2\hat{i}+3\hat{j}+\hat{k}, \vec{b}=\hat{i}-2\hat{j}+\hat{k} and c⃗=−3i^+j^+2k^\vec{c}=-3\hat{i}+\hat{j}+2\hat{k}, find [a⃗b⃗c⃗][\vec{a}\vec{b}\vec{c}]
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