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The ratio of the length of long chord and the tangent length of a circular curve of radius R deflecting through angle Î”, is

sin $\frac {Δ } { 2 }$

cos $\frac {Δ } { 2 }$

tan $\frac {Δ } { 2 }$

2 sin $\frac {Δ } { 2 }$

2 cos $\frac {Δ } { 2 }$

Answer : Option E

Explanation :

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