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Answer:
[tex]18x^2-6[/tex]
Step-by-step explanation:
By the power rule, [tex]\frac{d}{dx}x^n=nx^{n-1}[/tex]. Therefore, [tex]\frac{d}{dx}x^3+5x^3-6x+9=3x^2+15x^2-6=18x^2-6[/tex]