Returns the cosine of a complex number.
The cosine of a complex number can be expressed by its real and imaginary parts:
COSIM("NombreComplex")
Complex_number is a complex number whose cosine is to be calculated.
A complex number is a string expression resulting in the form "a+bi" or "a+bj", where a and b are numbers.
If the complex number is actually a real number (b=0), then it can be either a string expression or a number value.
La funció retorna sempre una cadena que representa un nombre complex.
Si el resultat és un nombre complex amb una de les parts (a o b) igual a zero, esta part no es mostra.
=IMCOS("4-3i")
returns -6.58066304055116-7.58155274274654i.
=IMCOS(2)
retorna -0416146836547142 com una cadena. La part imaginària equival a zero; per tant, no forma part del resultat.
