Справка LibreOffice 7.5
Returns the hyperbolic secant of a complex number. The hyperbolic secant of a complex number can be expressed by:
МНИМ.SECH(КомплексноеЧисло)
Complex_number is a complex number whose hyperbolic secant needs to be calculated.
=МНИМ.SECH("4-3i")
возвращает -0,0362534969158689+0,00516434460775318i.
=IMSECH(2)
returns 0.26580222883408 as a string. The imaginary part is equal to zero, so it is not displayed in the result.