# Documentation/Calc Functions/IMSIN Under construction. For now, see the system Help files.

IMSIN

## Summary:

Returns the sine of a complex number. The sine of a complex number can be expressed by:

sin(a+bi)=sin(a)cosh(b)+cos(a)sinh(b)i

## Syntax:

IMSIN(Complex_number)

## Returns:

The result is presented in the string format and has the character "i" or "j" as an imaginary unit.

The function always returns a string representing a complex number. If the result is a complex number with one of its parts (a or b) equal to zero, that part is not displayed.

## Arguments:

Complex_number is a complex number whose sine needs 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.

## Examples:

=IMSIN("4-3i") returns -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.

## ODF standard:

This function is part of the Open Document Format for Office Applications (OpenDocument) standard Version 1.2. (ISO/IEC 26300:2-2015)