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If alpha,beta,gamma be the angles which ...

If `alpha,beta,gamma` be the angles which a line makes with the coordinates axes, then

A

A. `cos(2alpha)+cos(2beta)+cos(2gamma)-1=0`

B

B. `cos(2alpha)+cos(2beta)+cos(2gamma)-2=0`

C

C. `cos(2alpha)+cos(2beta)+cos(2gamma)+1=0`

D

D. `cos(2alpha)+cos(2beta)+cos(2gamma)+2=0`

Text Solution

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The correct Answer is:
(c)
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