If a vector A⃗ makes an angles α, β and γ respectively with the x, y and z axes respectively. The...

If a vector A⃗ makes an angles α, β and γ respectively with the x, y and z axes respectively.
Then sin ^2α+sin ^2β+sin ^2γ is equal to
(a) 0
(b) 1
(c) 2

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