x
cos (2)*(pi*I + log(-cos(2)))
$$\left(\log{\left (- \cos{\left (2 \right )} \right )} + i \pi\right) \cos^{x}{\left (2 \right )}$$
2 x
(pi*I + log(-cos(2))) *cos (2)
$$\left(\log{\left (- \cos{\left (2 \right )} \right )} + i \pi\right)^{2} \cos^{x}{\left (2 \right )}$$
3 x
(pi*I + log(-cos(2))) *cos (2)
$$\left(\log{\left (- \cos{\left (2 \right )} \right )} + i \pi\right)^{3} \cos^{x}{\left (2 \right )}$$