According to Coulomb's law, the shearing strength of soil is

[c= Cohesion (apparent or actual), p= Normal stress on the plane of shear, $ϕ$ = Angle of internal friction or angle of shearing resistance]

- 1
  
  $c - p \tan ϕ$
- 2
  
  $p - c \tan ϕ$
- 3
  
  $c + p \tan ϕ$
- 4
  
  $p + c \tan ϕ$

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