# GATE2012-3

For the function f(t) = e$^{-t}/\tau$,
the Taylor series approximation for t$\ll$$\tau$ is
1. 1+$\frac{t}{\tau}$
2. 1-$\frac{t}{\tau}$
3. 1-$\frac{t^2}{2\tau^2}$