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(X+h)^3 + (x+h)-(x^3+x)
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(X+h)^3 + (x+h)-(x^3+x)

User MrOldSir
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((x+h)^3 + (x+h)-(x^3+x))/(h)=\\ (x^3+3x^2h+3xh^2+h^3+x+h-x^3-x)/(h)=\\ (3x^2h+3xh^2+h^3+h)/(h)=\\3x^2+3xh+h^2+1
User Bryan Drewery
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