Homework Help: Precalc

Posted by Grace on 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

Precalc - Steve, Wednesday, January 18, 2012 at 5:00am
recall that

cos²α + cos²β + cos²γ = 1

.36 + .49 + cos²γ = 1
cos²γ = .15
cosγ = 0.38

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