G.6.2.1 The cacosh functions

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• cacosh(conj(z)) = conj(cacosh(z)).

• cacosh((+-)0 + i0) returns +0 + ipi /2.

• cacosh(x + i (inf)) returns +(inf) + ipi /2, for finite x.

• cacosh(x + iNaN) returns NaN + iNaN and optionally raises the “invalid” floating-point exception, for finite x.

• cacosh(-(inf) + iy) returns +(inf) + ipi , for positive-signed finite y.

• cacosh(+(inf) + iy) returns +(inf) + i0, for positive-signed finite y.

• cacosh(-(inf) + i (inf)) returns +(inf) + i3pi /4.

• cacosh(+(inf) + i (inf)) returns +(inf) + ipi /4.

• cacosh((+-)(inf) + iNaN) returns +(inf) + iNaN.

• cacosh(NaN + iy) returns NaN + iNaN and optionally raises the “invalid” floating-point exception, for finite y.

• cacosh(NaN + i (inf)) returns +(inf) + iNaN.

• cacosh(NaN + iNaN) returns NaN + iNaN.