CrossWorks for ARM User Guide

DescriptionFast math librarybehaviorIEC 60559 mathbehaviorPortabilityacosf returns the principal value, in radians, of the inverse circular cosine of x. Theprincipal value lies in the interval [0, PI] radians.If |x| > 1, errno is set to EDOM and acosf returns HUGE_VAL.If x is NaN, acosf returns x.If |x| > 1, acosf returns NaN with invalid signal.acosf conforms to ISO/IEC 9899:1990 (C90) and ISO/IEC 9899:1999 (C99).acoshSynopsis#include double acosh(double x);Description acosh returns the non-negative inverse hyperbolic cosine of x.acosh(x) is defined as log(x + sqrt(x^2-1)), assuming completely accurate computation.Fast math librarybehaviorIEC 60559 mathlibrary behaviorPortabilityIf x< 1, errno is set to EDOM and acosh returns HUGE_VAL.If x < 1, acosh returns NaN with signal.If x is NaN, acosh returns NaN without signal .acosh conforms to ISO/IEC 9899:1999 (C99).acoshfSynopsis#include float acoshf(float x);Description acoshf returns the non-negative inverse hyperbolic cosine of x.Fast math librarybehaviorIEC 60559 mathlibrary behaviorPortabilityIf x< 1, errno is set to EDOM and acoshf returns HUGE_VALF.If x < 1, acoshf returns NaN with signal.If x is NaN, acoshf returns NaN without signal.acoshf conforms to ISO/IEC 9899:1999 (C99).asinSynopsis#include double asin(double x);256 Chapter 28 Standard C Library Reference