# Math Help - using the composite rule???

1. ## using the composite rule???

use the composite rule to differentiate the function
f(x)=e^(cosx+sinx)

please can you help???

2. you mean chain rule

e^(u(x)) differentiates to u '(x)*e^(u(x)) so in this case

f(x)= e^(cosx+sinx)
f`(x)=(-sinx+cosx)e^(cosx+sinx)