f(x)=x+3/x^3 = x+3x^(-3)
f'(x)=1+3*(-3)*x^(-4)= 1-9/x^4
f'(1) = 1-9/1 = 1-9=-8
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f(x)=x+3/x^3 = x+3x^(-3)
f'(x)=1+3*(-3)*x^(-4)= 1-9/x^4
f'(1) = 1-9/1 = 1-9=-8