A line makes acute angles of α, β and γ with the co-ordinate axes such that cos α cos β =…
Mathematics · JEE Main · NTA Exams — Three Dimensional Geometry
A line makes acute angles of α, β and γ with the co-ordinate axes such that cos α cos β = cos β cos \(\gamma=\frac{2}{9}\) and \(\cos \gamma \cos \alpha=\frac{4}{9}\), then cos α + cos β + cos γ is equal to :
- 25/9
- 5/9
- 5/3
- 2/3
Answer
(C) 5/3
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