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A line makes angles alpha,beta,gamma wi...

A line makes angles `alpha,beta,gamma` with the coordinate axes. If `alpha + beta = pi//2`, then `(cos alpha+cosbeta+cosgamma)^(2)` is equal to

A

`1+sin 2 alpha`

B

`1+sin 2alpha`

C

`1-sin 2 alpha`

D

`sin 2 alpha`

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The correct Answer is:
A
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AAKASH SERIES-STRAIGHT LINES (3D)-PRACTICE EXERCISE
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