## IMCOSH function

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

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

IMCOSH(Complex_number)

Complex_number is a complex number whose hyperbolic cosine is to be calculated.

=IMCOSH("4-3i")

returns -27.0349456030742-3.85115333481178i.

=IMCOSH(2)

returns 3.76219569108363 as a string. The imaginary part is equal to zero, so it is not displayed in the result.