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Method and examples
Descartes' rule of signs
 Enter a polynomial x^5-x^4+3x^3+9x^2-x+5x^3+3x^2+3x+18x^4+7x-6x^5+5x^4+10x^3+10x^2+5x+16x^4-x^3+4x^2-x-2x^4-6x^3+18x^2-30+25
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