The third derivative
[src]
1 3 1
-- + ----------- + ------------
2 2 2*x*(-1 + x)
x 8*(-1 + x)
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x*\/ -1 + x
$$\frac{\frac{3}{8 \left(x - 1\right)^{2}} + \frac{1}{2 x \left(x - 1\right)} + \frac{1}{x^{2}}}{x \sqrt{x - 1}}$$