Hi,

I don't know how to solve this limit I am aware of the approximation of the exponential function around 0 but it is not that helpful since T(t)/2 is non-zero (T is a temperature of about 200 degrees). If you have any ideas please let me know.

$\displaystyle \lim_{\Delta t\rightarrow 0}\frac{e^{\frac{T(t)}{2}}-e^{\frac{T(t-\Delta t)}{2}}}{\Delta t}$

Thanks a lot!

Regards,

Remus.