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1) f(x)=1/4x^8 - x^5 + 3
f'(x)=-2/x^7 - 5x^4
2) f(x)=3/x^2 - x
f'(x)=-6/x^3 - 1
........................................................................................
1) f(x)=1/4x^8 - x^5 + 3
f'(x)=-2/x^7 - 5x^4
2) f(x)=3/x^2 - x
f'(x)=-6/x^3 - 1