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## Homework Equations

## The Attempt at a Solution

I know that the sensistivity of a closed for at small change is given by the formula S = ∂ Ln T/∂ Ln G

And T(s) = G_c(s)G(s)/1 + G_c(s)G(s)

But since i don't have any G_c(s), i don't no how to solve it, and they get the result they get..