Справка LibreOffice 7.5
Returns the sine of a complex number. The sine of a complex number can be expressed by:
МНИМ.SIN(КомплексноеЧисло)
Complex_number is a complex number whose sine needs to be calculated.
=МНИМ.SIN("4-3i")
возвращает -7,61923172032141+6,548120040911i.
=IMSIN(2)
returns 0.909297426825682 as a string. The imaginary part is equal to zero, so it is not displayed in the result.