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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