Справка LibreOffice 7.5
Returns the cotangent of a complex number. The cotangent of a complex number can be expressed by:
МНИМ.COT(КомплексноеЧисло)
Complex_number is a complex number whose cotangent is to be calculated.
=МНИМ.COT("4-3i")
возвращает 0,00490118239430447+0,999266927805902i.
=IMCOT(2)
returns -0.457657554360286 as a string. The imaginary part is equal to zero, so it is not displayed in the result.