The ratio of the radius and apex distance of a curve deflecting through Δ°, is
\( [ sec\frac {Δ } { 2 }-1]\)
\( (1-sec\frac { Δ } { 2 }]\)
\([ cos (\frac {Δ } { 2 }-1]\)
\( [tan\frac { Δ } { 2 } -1]\)
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Answer : Option A
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