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If the position vectors of P\ a n d\ Q a...

If the position vectors of `P\ a n d\ Q` are ` hat i+3 hat j-7 hat k\ a n d\ 5 hat i-2 hat j+4 hat k` them the cosine of the angle between ` vec P Q` and y-axis is `5/(sqrt(162))` b. `4/(sqrt(162))` c. `-5/(sqrt(162))` d. `(11)/(sqrt(162))`

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