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Direction Cosines

What is the s...

Question

What is the sum of the squares of direction cosines of the line joining the points (1, 2, -3) and (-2, 3, 1) ?

A

0

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B

1

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C

3

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D

\frac{2}{\sqrt{26}}

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Solution

The correct option is D 1
the sum of the squares of direction cosines of the line is always 1

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