Returns the cosine of a complex number.

inumberThe complex number for which you want the cosine.

* If "inumber" is not in the form of x + yi or x + yj, then #NUM! is returned.
* If "inumber" is not text, then #VALUE! is returned.
* You can use the IMSIN function to return the sine of a complex number.
* You can use the IMTAN function to return the tangent of a complex number.
* You can use the COMPLEX function to convert real and imaginary coefficients into a complex number.
* For the Microsoft documentation refer to
* For the Google documentation refer to

2=IMCOS("1+i") = 0.833730025131149-0.988897705762865i
3=IMCOS("i") = 1.543
4=TEXT(IMCOS("i"),"0.000") = 1.543
5=IMCOS("some text") = #NUM!

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