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If a line makes angle alpha, beta and ga...

If a line makes angle `alpha, beta` and `gamma` with the coordinate axes respectively, then `cos2alpha+cos 2 beta+cos 2gamma=`

A

3

B

`-2`

C

2

D

`-1`

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The correct Answer is:
D
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-PRACTICE SET 23-Paper-2(MATHEMATICS)
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