Подробное решение
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Не могу найти шаги в поиске этой производной.
Но производная
Ответ:
cot(x) // 2 \ 3*cot(x)*sin(3*x)\
cos (3*x)*|\-1 - cot (x)/*log(cos(3*x)) - -----------------|
\ cos(3*x) /
$$\left(\left(- \cot^{2}{\left(x \right)} - 1\right) \log{\left(\cos{\left(3 x \right)} \right)} - \frac{3 \sin{\left(3 x \right)} \cot{\left(x \right)}}{\cos{\left(3 x \right)}}\right) \cos^{\cot{\left(x \right)}}{\left(3 x \right)}$$
/ 2 2 / 2 \ \
cot(x) |// 2 \ 3*cot(x)*sin(3*x)\ 9*sin (3*x)*cot(x) / 2 \ 6*\1 + cot (x)/*sin(3*x)|
cos (3*x)*||\1 + cot (x)/*log(cos(3*x)) + -----------------| - 9*cot(x) - ------------------ + 2*\1 + cot (x)/*cot(x)*log(cos(3*x)) + ------------------------|
|\ cos(3*x) / 2 cos(3*x) |
\ cos (3*x) /
$$\left(2 \left(\cot^{2}{\left(x \right)} + 1\right) \log{\left(\cos{\left(3 x \right)} \right)} \cot{\left(x \right)} + \left(\left(\cot^{2}{\left(x \right)} + 1\right) \log{\left(\cos{\left(3 x \right)} \right)} + \frac{3 \sin{\left(3 x \right)} \cot{\left(x \right)}}{\cos{\left(3 x \right)}}\right)^{2} + \frac{6 \left(\cot^{2}{\left(x \right)} + 1\right) \sin{\left(3 x \right)}}{\cos{\left(3 x \right)}} - \frac{9 \sin^{2}{\left(3 x \right)} \cot{\left(x \right)}}{\cos^{2}{\left(3 x \right)}} - 9 \cot{\left(x \right)}\right) \cos^{\cot{\left(x \right)}}{\left(3 x \right)}$$
/ 3 2 / 2 / 2 \ \ 2 / 2 \ 3 / 2 \ \
cot(x) | // 2 \ 3*cot(x)*sin(3*x)\ 2 / 2 \ // 2 \ 3*cot(x)*sin(3*x)\ | 9*sin (3*x)*cot(x) / 2 \ 6*\1 + cot (x)/*sin(3*x)| 27*sin (3*x)*\1 + cot (x)/ 2 / 2 \ 54*cot(x)*sin(3*x) 54*sin (3*x)*cot(x) 18*\1 + cot (x)/*cot(x)*sin(3*x)|
-cos (3*x)*|-27 + |\1 + cot (x)/*log(cos(3*x)) + -----------------| - 27*cot (x) + 2*\1 + cot (x)/ *log(cos(3*x)) + 3*|\1 + cot (x)/*log(cos(3*x)) + -----------------|*|-9*cot(x) - ------------------ + 2*\1 + cot (x)/*cot(x)*log(cos(3*x)) + ------------------------| - -------------------------- + 4*cot (x)*\1 + cot (x)/*log(cos(3*x)) + ------------------ + ------------------- + --------------------------------|
| \ cos(3*x) / \ cos(3*x) / | 2 cos(3*x) | 2 cos(3*x) 3 cos(3*x) |
\ \ cos (3*x) / cos (3*x) cos (3*x) /
$$- \left(4 \left(\cot^{2}{\left(x \right)} + 1\right) \log{\left(\cos{\left(3 x \right)} \right)} \cot^{2}{\left(x \right)} + \left(\left(\cot^{2}{\left(x \right)} + 1\right) \log{\left(\cos{\left(3 x \right)} \right)} + \frac{3 \sin{\left(3 x \right)} \cot{\left(x \right)}}{\cos{\left(3 x \right)}}\right)^{3} + 2 \left(\cot^{2}{\left(x \right)} + 1\right)^{2} \log{\left(\cos{\left(3 x \right)} \right)} + 3 \left(\left(\cot^{2}{\left(x \right)} + 1\right) \log{\left(\cos{\left(3 x \right)} \right)} + \frac{3 \sin{\left(3 x \right)} \cot{\left(x \right)}}{\cos{\left(3 x \right)}}\right) \left(2 \left(\cot^{2}{\left(x \right)} + 1\right) \log{\left(\cos{\left(3 x \right)} \right)} \cot{\left(x \right)} + \frac{6 \left(\cot^{2}{\left(x \right)} + 1\right) \sin{\left(3 x \right)}}{\cos{\left(3 x \right)}} - \frac{9 \sin^{2}{\left(3 x \right)} \cot{\left(x \right)}}{\cos^{2}{\left(3 x \right)}} - 9 \cot{\left(x \right)}\right) + \frac{18 \left(\cot^{2}{\left(x \right)} + 1\right) \sin{\left(3 x \right)} \cot{\left(x \right)}}{\cos{\left(3 x \right)}} - 27 \cot^{2}{\left(x \right)} - \frac{27 \left(\cot^{2}{\left(x \right)} + 1\right) \sin^{2}{\left(3 x \right)}}{\cos^{2}{\left(3 x \right)}} + \frac{54 \sin^{3}{\left(3 x \right)} \cot{\left(x \right)}}{\cos^{3}{\left(3 x \right)}} + \frac{54 \sin{\left(3 x \right)} \cot{\left(x \right)}}{\cos{\left(3 x \right)}} - 27\right) \cos^{\cot{\left(x \right)}}{\left(3 x \right)}$$