Q4 of 138 Page 24

Mark the correct alternative in each of the following:

Let be two unit vectors and α be the angle between them, then is a unit vector, if


Here, and are unit vectors.


i.e. and


If is unit vector then




()



( ;; )



Now,



We know and cosine is negative in second quadrant.



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If then =


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If then the angle between is


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 6

Mark the correct alternative in each of the following:

If the position vectors of P and Q are then the cosine of the angle between and y-axis is