The BESSELK function returns the modified Bessel function, which is equivalent to the Bessel functions evaluated for purely imaginary arguments.

BESSELK takes 2 required arguments and no optional arguments:

Syntax: BESSELK(x, n)

#1)
Using the BESSELK function:
#2)
The arguments for the BESSELK function are:
Argument Required? Description
x Required The value at which to evaluate the function.
n Required The order of the Bessel function. If n is not an integer, it is truncated.
#3)
A few more things:
If x is nonnumeric, BESSELK returns the #VALUE! error value.
If n is nonnumeric, BESSELK returns the #VALUE! error value.
If n < 0, BESSELK returns the #NUM! error value.

Summary

The BESSELK function returns the modified Bessel function, which is equivalent to the Bessel functions evaluated for purely imaginary arguments.
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