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The angle between two vectors given by 61 63 3k and 7i j 4k is...

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The angle between two vectors given by 61 63 3k and 7i j 4k is B D C COS 4 cal Correct option is D sin We know angle between two vectors is given by A B cos 8 A A B A 62 62 3 9 B 72 4 4 9 And A B 61 61 3k 7i 4j 4k 42 24 12 54 Now putting the above values in A we get 8 cos 0 sin 0 sin Tage 54 81 1 3 When we are multiplying 6i 6j 7i 4j 4k We do like this 6x7 6x4 j 3x4 k 42 24 12 because i 2 j k And not like the way we generally d multiplication in maths when we ar variables like this 61 71 4 4k 6 71 4 4k 3k 7i 4j 4k Can you please explain why it is so

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