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New expression for the derivative

With these definitions we obtain the following partial derivatives

\frac{\partial a}{\partial x} = 2x,

and

\frac{\partial b}{\partial a} = \exp{a},

and

\frac{\partial c}{\partial a} = 1,

and

\frac{\partial c}{\partial b} = 1,

and

\frac{\partial d}{\partial c} = \frac{1}{2\sqrt{c}},

and finally

\frac{\partial f}{\partial d} = 1.