If D is the distance between the parallel sidings and α is the angle of crossing, the distance between the noses of crossing measured parallel to the main track, is

If D is the distance between the parallel sidings and α is the angle

1.	If D is the distance between the parallel sidings and α is the angle of crossing, the distance between the noses of crossing measured parallel to the main track, is
A.	D tan α
B.	D sec α
C.	D cosec α
D.	D cot α
Answer» D. D cot α

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