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ASIN(3) BSD Library Functions Manual ASIN(3) NAME asin -- arc sine function SYNOPSIS #include <math.h> double asin(double x); long double asinl(long double x); float asinf(float x); DESCRIPTION The asin() function computes the principal value of the arc sine of x. The result is in the range [-pi/2, +pi/2]. SPECIAL VALUES asin(+-0) returns +-0. asin(x) returns a NAN and raises the "invalid" floating-point exception for |x| > 1. SEE ALSO acos(3), atan(3), atan2(3), cos(3), cosh(3), sin(3), sinh(3), tan(3), tanh(3), math(3) STANDARDS The asin() function conforms to ISO/IEC 9899:1999(E). BSD November 15, 2002 BSD |