The first derivative
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\-2 - 2*cot (2*x)/*sinh(x) + cosh(x)*cot(2*x)
$$\left(- 2 \cot^{2}{\left(2 x \right)} - 2\right) \sinh{\left(x \right)} + \cot{\left(2 x \right)} \cosh{\left(x \right)}$$
The second derivative
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cot(2*x)*sinh(x) - 4*\1 + cot (2*x)/*cosh(x) + 8*\1 + cot (2*x)/*cot(2*x)*sinh(x)
$$8 \left(\cot^{2}{\left(2 x \right)} + 1\right) \cot{\left(2 x \right)} \sinh{\left(x \right)} - 4 \left(\cot^{2}{\left(2 x \right)} + 1\right) \cosh{\left(x \right)} + \cot{\left(2 x \right)} \sinh{\left(x \right)}$$
The third derivative
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cosh(x)*cot(2*x) - 6*\1 + cot (2*x)/*sinh(x) - 16*\1 + cot (2*x)/*\1 + 3*cot (2*x)/*sinh(x) + 24*\1 + cot (2*x)/*cosh(x)*cot(2*x)
$$- 16 \left(\cot^{2}{\left(2 x \right)} + 1\right) \left(3 \cot^{2}{\left(2 x \right)} + 1\right) \sinh{\left(x \right)} + 24 \left(\cot^{2}{\left(2 x \right)} + 1\right) \cot{\left(2 x \right)} \cosh{\left(x \right)} - 6 \left(\cot^{2}{\left(2 x \right)} + 1\right) \sinh{\left(x \right)} + \cot{\left(2 x \right)} \cosh{\left(x \right)}$$