x*log(cos(x), 2)
x*sin(x) - -------- + log(cos(x), 2) cos(x)
/ / 2 \ \ | | sin (x)| 2*sin(x)| -|x*|1 + -------| + --------| | | 2 | cos(x) | \ \ cos (x)/ /
/ 2 \ | sin (x)| / 2*x*sin(x)\ -|1 + -------|*|3 + ----------| | 2 | \ cos(x) / \ cos (x)/