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The values returned by the mathematics functions on domain errors (7.5.1).

When a domain error occurs, the listed values are returned by the following
functions:

Function     Value returned

acos
0.0

acosh
- HUGE_VAL

asin
0.0

atan2
0.0

atanh
- HUGE_VAL

log
- HUGE_VAL

log10
- HUGE_VAL

log2
- HUGE_VAL

pow(neg,frac)
0.0

pow(0.0,0.0)
1.0

pow(0.0,neg)
- HUGE_VAL

sqrt
0.0

y0
- HUGE_VAL

y1
- HUGE_VAL

yn
- HUGE_VAL

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