If $α$ is the angle of crossing, then the number of crossings 'N' according to right angle method is given by

- 1
  
  $\frac{1}{2} c o t (\frac{α}{2})$
- 2
  
  $c o t (\frac{α}{2})$
- 3
  
  $c o t (α)$
- 4
  
  $\frac{1}{2} \cos e c (\frac{α}{2})$

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