Open System Services Library Calls Reference Manual (G06.29+, H06.08+, J06.03+)

cos(3) OSS Library Calls Reference Manual
For IEEE floating-point values, errno is not set to [EDOM] when the value of x is NaN.
For IEEE floating-point values, errno is not set to 0.0 (zero) when the value of x is posi-
tive or negative infinity.
errno is not set to [ERANGE] when the return value would cause underflow.
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