Convert a long double complex to a Complex.t. The real and imaginary components are converted by calling
LDouble.to_float which can produce unspecified results.
val zero : t
0 + i0
val one : t
1 + i0
val i : t
0 + i
polar norm arg returns the complex having norm
norm and argument
Argument. The argument of a complex number is the angle in the complex plane between the positive real axis and a line passing through zero and the number.