added check for Nan
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@ -9,6 +9,8 @@
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double __huge_val(void); /* may be infinity */
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#define HUGE_VAL (__huge_val())
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int __IsNan(double d); /* test for Not A Number */
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double acos(double _x);
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double asin(double _x);
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double atan(double _x);
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