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CASIN(3) BSD Library Functions Manual CASIN(3) NAME casin -- complex inverse sine function catan -- complex inverse tangent function SYNOPSIS #include <complex.h> double complex casin(double complex z); long double complex casinl(long double complex z); float complex casinf(float complex z); double complex catan(double complex z); long double complex catanl(long double complex z); float complex catanf(float complex z); DESCRIPTION casin(z) computes the inverse sine of the complex floating-point number z, with branch cuts outside the interval [-1, 1] on the real axis. ctan(z) computes the inverse tangent of the complex floating-point number z, with branch cuts outside the interval [-i, i] on the imaginary axis. Both functions return values in a strip of the complex plane with unbounded imaginary part, and real part in the interval [-Pi/2, Pi/2]. NOTES casin and catan are defined in terms of the complex inverse hyperbolic functions as follows: casin(z) = -i * casinh(i*z), catan(z) = -i * catanh(i*z). SEE ALSO casinh(3) catanh(3) complex(3) STANDARDS The casin() and catan() functions conform to ISO/IEC 9899:1999(E). 4th Berkeley Distribution November 9, 2006 4th Berkeley Distribution |