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If a variable line in two adjacent posit...

If a variable line in two adjacent positions has direction cosines (l,m,n) and `(l + delta l, m + delta m, n + delta n)` , then show that the small angle `delta theta` between the two position is given by `(delta theta)^(2) = (delta l)^(2) + (delta m)^(2)+ (delta n)^(2)`

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