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If alpha,beta, gamma are the direction a...

If `alpha,beta, gamma` are the direction angles of a vector and `cos alpha=(14)/(15), cos beta=(1)/(3)`, then `cos gamma=`

A

`pm(2)/(15)`

B

`pm(1)/(5)`

C

`pm (1)/(15)`

D

`pm (4)/(15)`

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The correct Answer is:
A
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NIKITA PUBLICATION-THREE DIMENSIONAL GEOMETRY -MULTIPLE CHOICE QUESTIONS
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  10. If A(3, 5, -4), B(-1, 1, 2) and C(-5, -5, -2) are the vertices of Delt...

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  11. If A(3, 5, -4), B(-1, 1, 2) and C(-5, -5, -2) are the vertices of Delt...

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  12. If A(3, 5, -4), B(-1, 1, 2) and C(-5, -5, -2) are the vertices of Delt...

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  13. Which of the following is true ?

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  14. Which of the following represents direction consines of the line ?

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  15. Which of the triplet can not represent direction cosines of a line ?

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