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## Homework Statement

Voltage across 0.2-F cap is given by

v(t)=4(1-Є^(-10t)) for t>0

determine expression for the current i(t)

## Homework Equations

i(t)=c (dv(t))/dt

## The Attempt at a Solution

I'm really not sure were to begin with this problem what is the Є symbol and how do you take the derivative of it?