Q 1387423387.     If a line makes angle `alpha`, `beta, gamma` with `x`-axis, `y`-axis and `z`-axis respectively, then `sin^2 alpha+sin^2 beta+sin^2 gamma=` ?

A

`2`

B

`1`

C

`0`

D

`3`

HINT

we know that `cos^2 alpha+cos^2 beta+cos^2 gamma=1`

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