Y = Xe ^ - x derivative I want to know what the derivative of e ^ - x is The derivative of e ^ x is e ^ X. what about e ^ - x

Y = Xe ^ - x derivative I want to know what the derivative of e ^ - x is The derivative of e ^ x is e ^ X. what about e ^ - x

y'=e^(-x)+x(-e^(-x))
=e^(-x)(1-x)
The derivative of e ^ (- x) is - e ^ (- x)