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## Homework Statement

Determine the value of f(-1) when

## Homework Equations

f(x) = (x/2^2) + ((2x^3)/2^4)+((3x^5)/2^6)+... .

(Hint: differentiate the power series representation of ((x^2)-2^2)^(-1).)

## The Attempt at a Solution

I was not very sure were to begin on this one. So I followed what the hint said.

the power series representation is n = 0 to infinity -sigma x^(2n)/4^(n+1)

Then i tried taking the derivative but it left me with no idea were to continue...frustrated to say the least