Hello!

Is there a way to turn off the automatic simplification by calculating the 
derivative of a function? For example

t = sym.symbols('t')
sym.Derivative( (sin(t)+exp(t))**3 , t ).doit()

gives:
(exp(t) + sin(t))**2*(3*exp(t) + 3*cos(t))

I need the result without any simplifications (in order to detect the inner 
derivative for further calculations)

Should be:
(exp(t) + sin(t))**2*3*(exp(t) + cos(t))

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