Derivada de x*tgx*thx

  //       2        /       2   \       \           /         2   \ /  /       2   \         \     /         2   \               \
2*\\1 + tan (x) + x*\1 + tan (x)/*tan(x)/*tanh(x) - \-1 + tanh (x)/*\x*\1 + tan (x)/ + tan(x)/ + x*\-1 + tanh (x)/*tan(x)*tanh(x)/

$$2 \left(x \left(\tanh^{2}{\left(x \right)} - 1\right) \tan{\left(x \right)} \tanh{\left(x \right)} - \left(x \left(\tan^{2}{\left(x \right)} + 1\right) + \tan{\left(x \right)}\right) \left(\tanh^{2}{\left(x \right)} - 1\right) + \left(x \left(\tan^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)} + \tan^{2}{\left(x \right)} + 1\right) \tanh{\left(x \right)}\right)$$

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  /    /         2   \ /       2        /       2   \       \   /       2   \ /             /         2   \\             /         2   \ /  /       2   \         \             /         2   \ /           2   \       \
2*\- 3*\-1 + tanh (x)/*\1 + tan (x) + x*\1 + tan (x)/*tan(x)/ + \1 + tan (x)/*\3*tan(x) + x*\1 + 3*tan (x)//*tanh(x) + 3*\-1 + tanh (x)/*\x*\1 + tan (x)/ + tan(x)/*tanh(x) - x*\-1 + tanh (x)/*\-1 + 3*tanh (x)/*tan(x)/

$$2 \left(- x \left(\tanh^{2}{\left(x \right)} - 1\right) \left(3 \tanh^{2}{\left(x \right)} - 1\right) \tan{\left(x \right)} + 3 \left(x \left(\tan^{2}{\left(x \right)} + 1\right) + \tan{\left(x \right)}\right) \left(\tanh^{2}{\left(x \right)} - 1\right) \tanh{\left(x \right)} + \left(x \left(3 \tan^{2}{\left(x \right)} + 1\right) + 3 \tan{\left(x \right)}\right) \left(\tan^{2}{\left(x \right)} + 1\right) \tanh{\left(x \right)} - 3 \left(\tanh^{2}{\left(x \right)} - 1\right) \left(x \left(\tan^{2}{\left(x \right)} + 1\right) \tan{\left(x \right)} + \tan^{2}{\left(x \right)} + 1\right)\right)$$

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