...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
#include <boost/math/complex/acos.hpp>
template<class T> std::complex<T> acos(const std::complex<T>& z);
Effects: returns the inverse cosine of the complex number z.
Formula: