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If S is the switch angle and Î± is diamond angle, r is the radius of slip, the distance between middle point slip and the nose of obtuse crossing, is

r [sec $[\frac { a} { 2 } -s]-1$ ]

r [ sec [ s - $\frac { a } { 2 }$ ]-1]

r [sec [ $\frac { a-s } { 2 }$ ]-1]

r [ sec [ $\frac { a-s } { 2 }$ ] +1]

Answer : Option A

Explanation :

No answer description available for this question.

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