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posted by Grace Tuesday, January 17, 2012 at 11:49pm.
If α, β, and γ are direction angles for a vector in three dimensions and cos α = 0.6 and cos β = 0.7, find cos γ
recall that cos^{2}α + cos^{2}β + cos^{2}γ = 1 .36 + .49 + cos^{2}γ = 1 cos^{2}γ = .15 cosγ = 0.38
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