Fewpal
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in Three-dimensional geometry by (36.9k points)

A line makes an angle α, β and γ with the axes, then the value of cos(2α) + cos(2β) + cos(2γ) is 

(a) 1 

(b) 2 

(c) –1 

(d) 0. 

1 Answer

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Best answer

Answer is (b) 2

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