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

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

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