If a line makes angles α, β, g respectively with the co-ordinate axes

If a line makes angles α, β, g respectively with the co-ordinate axes, then sin2g-cos2 α-cos2 β=
(a) 1
(b) 0
(c) -1
(d) 2

Anurag Mishra Professor Asked on 28th May 2016 in Maths.
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