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27 /* casin (Z ) = -I * clog(I * Z + csqrt (1.0 - Z * Z))) */
29 double complex casin (double complex Z)
39 __real__ Res = asin (x);
42 else /* -I * clog(I * Z + csqrt(1.0 - Z * Z))) */
46 /* Z * Z = ((x - y) * (x + y)) + (2.0 * x * y) * I */
47 /* calculate 1 - Z * Z */
48 __real__ ZZ = 1.0 - (x - y) * (x + y);
49 __imag__ ZZ = -2.0 * x * y;
61 __real__ Res = __imag__ ZZ;
62 __imag__ Res = - __real__ ZZ;