In a two-dimensional incompressible flow, if the fluid velocity components are given by

$u = x - 4 y, v = - y - 4 x$

then the stream function $ψ$ is given by

- 1
  
  $x^{2} - x y + 2 y^{2}$
- 2
  
  $2 x^{2} + 2 x y + y^{2}$
- 3
  
  $2 x^{2} + x y - 2 y^{2}$
- 4
  
  $2 x^{2} - x y + 2 y^{2}$

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