F.9.5.4 The tgamma functions

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• tgamma((+-)0) returns (+-)(inf) and raises the “divide-by-zero” floating-point exception.

• tgamma(x) returns a NaN and raises the “invalid” floating-point exception for x a negative integer.

• tgamma(-(inf)) returns a NaN and raises the “invalid” floating-point exception.

• tgamma(+(inf)) returns +(inf).