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Question

If the direction cosines of a variable line in two adjacent positions be l, m, n and l + a, m + b, n + c and the small angle between the two positions be θ, then :

A
θ=a+b+c
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B
θ2=a2+b2+c2
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C
|θ|=|a|+|b|+|c|
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D
θ3=a3+b3+c3
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