template<class T> constexpr T real(const complex<T>& x);
template<class T> constexpr T imag(const complex<T>& x);
template<class T> T abs(const complex<T>& x);
Returns: The magnitude of x.
template<class T> T arg(const complex<T>& x);
Returns: The phase angle of x, or atan2(imag(x), real(x)).
template<class T> T norm(const complex<T>& x);
Returns: The squared magnitude of x.
template<class T> complex<T> conj(const complex<T>& x);
Returns: The complex conjugate of x.
template<class T> complex<T> proj(const complex<T>& x);
Returns: The projection of x onto the Riemann sphere.
Remarks: Behaves the same as the C function cproj, defined in 7.3.9.4.
template<class T> complex<T> polar(const T& rho, const T& theta = 0);
Returns: The complex value corresponding to a complex number whose magnitude is rho and whose phase angle is theta.
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