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*Here 'z' is any positive real number i.e, <math>z \ge 1</math>.
*Here 'z' is any positive real number i.e, <math>z \ge 1</math>.
*Inverse Hyperbolic sine of a number is defined by <math>Acosh(z)=log e(z+\sqrt{z^2-1})</math>
*Inverse Hyperbolic sine of a number is defined by <math>Acosh(z)=log e(z+\sqrt{z^2-1})</math>
*Also ACOSH(COSH(z))=z
*ACOSH(-2)=NAN , since z<1
*ACOSH(-2)=NAN , since z<1