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Command Summary

Calculates the inverse hyperbolic cosine of a value.

Command Syntax


Menu Location

The coshֿ¹( command can only be found in the catalog. Press:

  1. 2nd CATALOG to access the command catalog.
  2. C to skip to commands starting with C.
  3. Scroll down and select coshֿ¹(

Calculator Compatibility


Token Size

1 byte

The coshֿ¹( function gives the inverse hyperbolic cosine of a value. coshֿ¹(x) is the number y such that x = cosh(y).

Although coshֿ¹(x) can be defined for all real and complex numbers, it assumes real values only for x≥1. Since hyperbolic functions in the Z80 calculators are restricted only to real values, ERR:DOMAIN is thrown when x<1.

The coshֿ¹( command also works for lists.

	{1.316957897 1.762747174}

Error Conditions

  • ERR:DOMAIN when taking the inverse cosh of a number less than 1.

Related Commands