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Q.

If a→ and b→ are non-zero non-collinear vectors, then [a→b→i^]i^+[a→b→j^]j^+[a→b→k^]k^ is equal to

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a

a→+b→

b

a→×b→

c

a→-b→

d

b→-a→

answer is B.

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Detailed Solution

Let a→×b→=xi^+yj^+zk^. Therefore, [a→b→i^]=(a→×b→)⋅i^=x[a→b→j^]=(a→×b→)⋅j^=y[a→b→k→]=(a→×b→)⋅k^=z Hence, [a→b→i^]i^+[a→b→j^]j^=[a→b→k^]k^=xi^+yj^+zk^=a→×b→hence [a→b→i^]i^+[a→b→j^]j^=[a→b→k^]k^=xi^+yj^+zk^=a→×b→
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