-2*atan(cos(x))*sin(x)
----------------------
2
1 + cos (x)
$$- \frac{2 \sin{\left (x \right )} \operatorname{atan}{\left (\cos{\left (x \right )} \right )}}{\cos^{2}{\left (x \right )} + 1}$$
/ 2 2 \
| sin (x) 2*sin (x)*atan(cos(x))*cos(x)|
2*|----------- - atan(cos(x))*cos(x) - -----------------------------|
| 2 2 |
\1 + cos (x) 1 + cos (x) /
---------------------------------------------------------------------
2
1 + cos (x)
$$\frac{1}{\cos^{2}{\left (x \right )} + 1} \left(- 2 \cos{\left (x \right )} \operatorname{atan}{\left (\cos{\left (x \right )} \right )} - \frac{4 \sin^{2}{\left (x \right )} \operatorname{atan}{\left (\cos{\left (x \right )} \right )}}{\cos^{2}{\left (x \right )} + 1} \cos{\left (x \right )} + \frac{2 \sin^{2}{\left (x \right )}}{\cos^{2}{\left (x \right )} + 1}\right)$$
/ 2 2 2 2 2 \
| 3*cos(x) 6*cos (x)*atan(cos(x)) 2*sin (x)*atan(cos(x)) 6*sin (x)*cos(x) 8*cos (x)*sin (x)*atan(cos(x)) |
2*|----------- - ---------------------- + ---------------------- + ---------------- - ------------------------------ + atan(cos(x))|*sin(x)
| 2 2 2 2 2 |
|1 + cos (x) 1 + cos (x) 1 + cos (x) / 2 \ / 2 \ |
\ \1 + cos (x)/ \1 + cos (x)/ /
-------------------------------------------------------------------------------------------------------------------------------------------
2
1 + cos (x)
$$\frac{2 \sin{\left (x \right )}}{\cos^{2}{\left (x \right )} + 1} \left(\operatorname{atan}{\left (\cos{\left (x \right )} \right )} + \frac{2 \sin^{2}{\left (x \right )} \operatorname{atan}{\left (\cos{\left (x \right )} \right )}}{\cos^{2}{\left (x \right )} + 1} - \frac{6 \cos^{2}{\left (x \right )} \operatorname{atan}{\left (\cos{\left (x \right )} \right )}}{\cos^{2}{\left (x \right )} + 1} + \frac{3 \cos{\left (x \right )}}{\cos^{2}{\left (x \right )} + 1} - \frac{8 \sin^{2}{\left (x \right )} \cos^{2}{\left (x \right )}}{\left(\cos^{2}{\left (x \right )} + 1\right)^{2}} \operatorname{atan}{\left (\cos{\left (x \right )} \right )} + \frac{6 \sin^{2}{\left (x \right )} \cos{\left (x \right )}}{\left(\cos^{2}{\left (x \right )} + 1\right)^{2}}\right)$$