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The acosh() function returns the inverse hyperbolic cosine of the argument as a number. A mathematical identity of the function is:
The domain is the closed interval , that is, the value of x must be greater than or equal to 1.
Use the calculator at the top right of the window to find the inverse hyperbolic cosine of a number. Click the [2nd] key at the top left of the keypad, then click [acosh].