pi / 1 \ -- - 2*acot|------------------| 2 | _____________| | / / 4*x\ | | / | 1 - ---| | | / | 1 | | \\/ W\e / /
pi/2 - 2*acot(1/(sqrt(LambertW(exp(1 - 4*x/1)))))
4*x 4*x 1 - --- -1 + --- 1 1 4*e *e ------------------------------------------------------ _____________ / / 4*x\\ / / 4*x\ | | 1 - ---|| / | 1 - ---| / 1 \ | | 1 || / | 1 | |1 + -----------|*\1 + W\e //*\/ W\e / | / 4*x\| | | 1 - ---|| | | 1 || \ W\e //