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acos, acosf — ??;???ؿ?

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Math Library (libm, -lm)

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#include <math.h> double acos(double x) float acosf(float x)

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acos() ?????? acosf() ?ؿ??ϡ? x ?ε?;???μ??ͤ??׻????ޤ??? [-1, +1] ?ζ??ֳ??ΰ????ˤ??äơ??ΰ襨?顼??ȯ?????ޤ??? ?ݤ??ˤ????????ε????ϡ? math(3) ?򻲾Ȥ??Ƥ?????????

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acos() ?????? acosf() ?ؿ??ϡ? [0, pi] ?饸?????ζ??֤ε?;?????֤??ޤ??? VAX ?????? Tahoe ?Ǥϡ?

|x| > 1

?ξ????ˡ? acos(x) ?ϥ??????Х??ѿ? errno ?? EDOM ?????ꤷ??ͽ?󤵤줿???ڥ????ɥե????Ȥ??????????ޤ???

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asin(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3), tan(3), tanh(3)

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acos() ?ؿ??ϡ? ISO/IEC 9899:1990 (“ISO C90”) ??Ŭ?礷?Ƥ??ޤ???