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If P(2,3,-6) , Q (3, -4,5) are two point...

If P(2,3,-6) , Q (3, -4,5) are two points, find the d.c's of `vec(OP), vec(QO) and vec(PQ)` where O is the origin.

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The correct Answer is:
`vec(OP)` are = `((2)/(7),(3)/(7),(-6)/(7))`
`vec(QP)` are = `((-3)/(5sqrt(2)),(4)/(5sqrt(2)),(-1)/(sqrt(2)))`
`vec(PQ)` are = `((1)/(sqrt(171)),(-7)/(sqrt(171)),(11)/(sqrt(171)))`
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