/ 2 \
x*\4 + 4*tan (4*x - 1)/ + tan(4*x - 1)
$$x \left(4 \tan^{2}{\left(4 x - 1 \right)} + 4\right) + \tan{\left(4 x - 1 \right)}$$
/ 2 / 2 \ \
8*\1 + tan (-1 + 4*x) + 4*x*\1 + tan (-1 + 4*x)/*tan(-1 + 4*x)/
$$8 \left(4 x \left(\tan^{2}{\left(4 x - 1 \right)} + 1\right) \tan{\left(4 x - 1 \right)} + \tan^{2}{\left(4 x - 1 \right)} + 1\right)$$
/ 2 \ / / 2 \\
32*\1 + tan (-1 + 4*x)/*\3*tan(-1 + 4*x) + 4*x*\1 + 3*tan (-1 + 4*x)//
$$32 \left(4 x \left(3 \tan^{2}{\left(4 x - 1 \right)} + 1\right) + 3 \tan{\left(4 x - 1 \right)}\right) \left(\tan^{2}{\left(4 x - 1 \right)} + 1\right)$$