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If a line makes angles alpha,beta,gamma ...

If a line makes angles `alpha,beta,gamma` with co-ordinate axes, then `cos2alpha+cos 2 beta+cos2gamma=`

A

`-2`

B

`-1`

C

1

D

2

Text Solution

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The correct Answer is:
B
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TARGET PUBLICATION-THREE DIMENSIONAL GEOMETRY -Critical Thinking
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