Подробное решение
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Не могу найти шаги в поиске этой производной.
Но производная
Ответ:
/ / 2 \\
3*x | 3*x*\-3 - 3*cot (3*x)/|
cot (3*x)*|3*log(cot(3*x)) + ----------------------|
\ cot(3*x) /
$$\left(\frac{3 x \left(- 3 \cot^{2}{\left(3 x \right)} - 3\right)}{\cot{\left(3 x \right)}} + 3 \log{\left(\cot{\left(3 x \right)} \right)}\right) \cot^{3 x}{\left(3 x \right)}$$
/ 2 \
|/ / 2 \\ / / 2 \\|
3*x || 3*x*\1 + cot (3*x)/| / 2 \ | 2 3*x*\1 + cot (3*x)/||
9*cot (3*x)*||-log(cot(3*x)) + -------------------| - \1 + cot (3*x)/*|-6*x + -------- + -------------------||
|\ cot(3*x) / | cot(3*x) 2 ||
\ \ cot (3*x) //
$$9 \left(\left(\frac{3 x \left(\cot^{2}{\left(3 x \right)} + 1\right)}{\cot{\left(3 x \right)}} - \log{\left(\cot{\left(3 x \right)} \right)}\right)^{2} - \left(\cot^{2}{\left(3 x \right)} + 1\right) \left(- 6 x + \frac{3 x \left(\cot^{2}{\left(3 x \right)} + 1\right)}{\cot^{2}{\left(3 x \right)}} + \frac{2}{\cot{\left(3 x \right)}}\right)\right) \cot^{3 x}{\left(3 x \right)}$$
/ 3 2 3 2\
| / / 2 \\ / 2 \ / 2 \ / / 2 \\ / / 2 \\ / 2 \ |
3*x | | 3*x*\1 + cot (3*x)/| 2 3*\1 + cot (3*x)/ / 2 \ 6*x*\1 + cot (3*x)/ / 2 \ | 3*x*\1 + cot (3*x)/| | 2 3*x*\1 + cot (3*x)/| 12*x*\1 + cot (3*x)/ |
27*cot (3*x)*|6 - |-log(cot(3*x)) + -------------------| + 6*cot (3*x) - ------------------ - 12*x*\1 + cot (3*x)/*cot(3*x) - -------------------- + 3*\1 + cot (3*x)/*|-log(cot(3*x)) + -------------------|*|-6*x + -------- + -------------------| + ---------------------|
| \ cot(3*x) / 2 3 \ cot(3*x) / | cot(3*x) 2 | cot(3*x) |
\ cot (3*x) cot (3*x) \ cot (3*x) / /
$$27 \left(- 12 x \left(\cot^{2}{\left(3 x \right)} + 1\right) \cot{\left(3 x \right)} - \left(\frac{3 x \left(\cot^{2}{\left(3 x \right)} + 1\right)}{\cot{\left(3 x \right)}} - \log{\left(\cot{\left(3 x \right)} \right)}\right)^{3} + 3 \cdot \left(\frac{3 x \left(\cot^{2}{\left(3 x \right)} + 1\right)}{\cot{\left(3 x \right)}} - \log{\left(\cot{\left(3 x \right)} \right)}\right) \left(\cot^{2}{\left(3 x \right)} + 1\right) \left(- 6 x + \frac{3 x \left(\cot^{2}{\left(3 x \right)} + 1\right)}{\cot^{2}{\left(3 x \right)}} + \frac{2}{\cot{\left(3 x \right)}}\right) + \frac{12 x \left(\cot^{2}{\left(3 x \right)} + 1\right)^{2}}{\cot{\left(3 x \right)}} + 6 \cot^{2}{\left(3 x \right)} - \frac{6 x \left(\cot^{2}{\left(3 x \right)} + 1\right)^{3}}{\cot^{3}{\left(3 x \right)}} - \frac{3 \left(\cot^{2}{\left(3 x \right)} + 1\right)^{2}}{\cot^{2}{\left(3 x \right)}} + 6\right) \cot^{3 x}{\left(3 x \right)}$$