Allgemein
[ eterm ] ´ = eterm + ( term ´ )
[ e-x ] ´= e-x * (-1) = - e-x
Produktregel
( u * v ) ´ = u´ * v + u * v´
u = x + 2
u ´= 1
v = e-x
v ´= - e-x
[ ( x + 2 ) * e-x ] ´ = 1 * e-x + ( x + 2 ) * ( - e-x )
1 * e-x + ( - x - 2 ) * e-x
e-x * ( 1 - x - 2 )
e-x * ( - x - 1 )