A cantilever of constant depth carries a uniformly distributed load on the whole span. To make the maximum stress at all

sections the same, the breadth of the section at a distance $x$ from the free end should be proportional to

- 1
  
  $x$
- 2
  
  $\sqrt{x}$
- 3
  
  $x^{2}$
- 4
  
  $x^{3}$

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