Differentiating Exponential Functions with Calculators
Key Questions

#f'(x)=3*e^(13x)# Explanation :
#f(x)=e^(1−3x)=e*e^(3x)# This type of problems solve by Chain Rule.
let's assume
#y=e^(f(x))# then, using Chain Rule,
#y'=e^(f(x))*f'(x)# Similarly, following for the given problem,
#f'(x)=e*(3)*e^(3x)# #f'(x)=3*e^(13x)#