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A variable line in two adjacent position...

A variable line in two adjacent positions has direction cosines `l, m, n` and `l+delta l, m+deltam, n+delta n`. Prove that the small angle `delta theta` between the two positions of the variable line is given by, `(delta theta)^(2)=(delta l)^(2)+(delta m)^(2)+(delta n)^(2)`

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