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[" 13.If "f(x)=x^(3)+7x^(2)+8x-9" ,find ...

[" 13.If "f(x)=x^(3)+7x^(2)+8x-9" ,find "f'(4)],[" 14.If "f(x)=x^(3)-2x+1," show that "f'(2)=10f'(1)],[" is "1" ferent "x^(3)" and "x" show that "f'(x)=2" frets "]

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