Question

the direction cosines of the directed line from P(1,-2,4) to Q(-1,1,-2) are?​

Answer 1

Answer:

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Step-by-step explanation:

Given the points are P(1,−2,4) and Q(−1,1,−2).

Now the direction ratios of the ray PQ are (−1−1,1+2,−2−4)=(−2,3,−6).

The direction cosines of the line PQ will be (

2

2

+3

2

+6

2

2

,

2

2

+3

2

+6

2

3

,

2

2

+3

2

+6

2

−6

)=(

7

−2

,

7

3

,

7

−6

).