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Descartes' rule of signs
 
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  1. `x^5-x^4+3x^3+9x^2-x+5`
  2. `x^3+3x^2+3x+1`
  3. `8x^4+7x-6`
  4. `x^5+5x^4+10x^3+10x^2+5x+1`
  5. `6x^4-x^3+4x^2-x-2`
  6. `x^4-6x^3+18x^2-30+25`
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