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

If a line makes `alpha , beta , gamma` with the positive direction of x,y,z-axis respectively . Then `cos^2 alpha + cos^2 beta + cos^2 gamma ` is equal to :

A

`1//2`

B

`-1//2`

C

`-1`

D

`1`

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IPUCET PREVIOUS YEAR PAPERS-GGSIPU MATHEMATICS 2004-MCQ
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