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f'(x)=3x^2+6mx+n f'(-1)=3-6m+n=0 f(-1)=-1+3m-n+m^2=0 m^2+3m-(6m-3)-1=0 m^2-3m+2=0 (m-1)(m-2)=0 m=1,n=6-3=3 m=2,n=12-3=9
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