Integral de xdx/sin^4x dx

  /                      /       2/x\\                   2/x\        /   /x\\                                3/x\          /x\
 |                  2*log|1 + tan |-||                tan |-|   2*log|tan|-||                           x*tan |-|   3*x*tan|-|
 |    x                  \        \2//       1            \2/        \   \2//     3*x          x              \2/          \2/
 | ------- dx = C - ------------------ - ---------- - ------- + ------------- - -------- - ---------- + --------- + ----------
 |    4                     3                  2/x\      24           3              /x\         3/x\       24          8     
 | sin (x)                               24*tan |-|                             8*tan|-|   24*tan |-|                         
 |                                              \2/                                  \2/          \2/                         
/                                                                                                                             

$$\int \frac{x}{\sin^{4}{\left(x \right)}}\, dx = C + \frac{x \tan^{3}{\left(\frac{x}{2} \right)}}{24} + \frac{3 x \tan{\left(\frac{x}{2} \right)}}{8} - \frac{3 x}{8 \tan{\left(\frac{x}{2} \right)}} - \frac{x}{24 \tan^{3}{\left(\frac{x}{2} \right)}} - \frac{2 \log{\left(\tan^{2}{\left(\frac{x}{2} \right)} + 1 \right)}}{3} + \frac{2 \log{\left(\tan{\left(\frac{x}{2} \right)} \right)}}{3} - \frac{\tan^{2}{\left(\frac{x}{2} \right)}}{24} - \frac{1}{24 \tan^{2}{\left(\frac{x}{2} \right)}}$$

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