For this equation, do i use quotient rule? or how should i do?
derivative of -e^-ab is it become e^ab ?
更新1:
with a >0 and b >0
更新2:
derivative of u(w)
更新3:
by quotient rule, is the answer like this? u'(w) = [(e^ab)(ab)'a - (1-e^-ab)a'] / a^2
更新4:
if the answer is correct, what is the u''(w)?
