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(Solved): 1. Let \( \cos \alpha, \cos \beta, \cos \gamma \) be the direction cosines of a non-zero vector \( ...
1. Let \( \cos \alpha, \cos \beta, \cos \gamma \) be the direction cosines of a non-zero vector \( a= \). Find and simplify the following expression \( \cos ^{2} \alpha+\cos ^{2} \beta+\cos ^{2} \gamma \)