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simple question


In[1]:=
Integrate[Tanh[x^2 + 3]*x, x]
D[%, x]
FullSimplify[% - Tanh[x^2 + 3]*x]

Out[1]=
(1/2)*Log[Cosh[x^2] + E^6*Cosh[x^2] - Sinh[x^2] + E^6*Sinh[x^2]]

Out[2]=
(-2*x*Cosh[x^2] + 2*E^6*x*Cosh[x^2] + 2*x*Sinh[x^2] +
2*E^6*x*Sinh[x^2])/
  (2*(Cosh[x^2] + E^6*Cosh[x^2] - Sinh[x^2] + E^6*Sinh[x^2]))

Out[3]=
0

How is it possible to write Out[2] in the form Tanh[x^2 + 3]*x with the
use of Built in functions?

Thanks
Dimitris


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