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## Homework Statement

F(s) = ( s - [tex]\frac{1}{s^2}[/tex])

^{3}

I have to calculate the derivative of this using chain rule everytime i try i get something way different than in the back of the book... my first move is

3( s - [tex]\frac{1}{s^2}[/tex])

^{2}X ( 1 + [tex]\frac{2}{s^3}[/tex])

is this correct? then expand out from here? maybe theres a problem when i expand.. i dont know but any help would be great thanks...