Ответ (Неопределённый)
[src] /
| 2 2
| 2 2*x*sin (log(x)) 3*x*cos (log(x)) 2*x*cos(log(x))*sin(log(x))
| cos (log(x)) dx = C + ---------------- + ---------------- + ---------------------------
| 5 5 5
/
$$\int \cos^{2}{\left(\log{\left(x \right)} \right)}\, dx = C + \frac{2 x \sin^{2}{\left(\log{\left(x \right)} \right)}}{5} + \frac{2 x \sin{\left(\log{\left(x \right)} \right)} \cos{\left(\log{\left(x \right)} \right)}}{5} + \frac{3 x \cos^{2}{\left(\log{\left(x \right)} \right)}}{5}$$