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# IMCOS function

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

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

### Syntax

IMCOS(Complex_number)

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.

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.

### Examples

=IMCOS("4-3i")
returns -6.58066304055116-7.58155274274654i.

=IMCOS(2)
returns -0.416146836547142 as a string. The imaginary part is equal to zero, so it is not displayed in the result.

#### Technical information

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

Related Topics

IMCOS wiki page.

IMCOSH , IMSIN , IMSINH

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