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  /src/lib/libm/complex/
catanh.c 1 /* $NetBSD: catanh.c,v 1.1 2007/08/20 16:01:32 drochner Exp $ */
36 catanh(double complex z) function in typeref:typename:double complex
catrig.c 96 * The code for catanh and catan comes at the end. It is much simpler than
515 * | catanh, catan |
578 * catanh(z) = log((1+z)/(1-z)) / 2
582 * catanh(z) = z + O(z^3) as z -> 0
584 * catanh(z) = 1/z + sign(y)*I*PI/2 + O(1/z^3) as z -> infinity
586 * Re(catanh(z)) = x/|z|^2 + O(x/z^4)
590 catanh(double complex z) function in typeref:typename:double complex
608 /* catanh(+-Inf + I*NaN) = +-0 + I*NaN */
611 /* catanh(NaN + I*+-Inf) = sign(NaN)0 + I*+-PI/2 */
653 * catan(z) = reverse(catanh(reverse(z))
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