If a point in a strained material is subjected to euql normal and tangential stresses, then the angle of obliquity is

- 1
  
  $0^{o}$
- 2
  
  $45^{o}$
- 3
  
  $\tan^{- 1} (1 / 2)$
- 4
  
  $\tan^{- 1} (2)$

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