ccosh(3)

💖 ccosh — the complex hyperbolic cosine, bestie 💖

okay so this is the man page for ccosh(3), and honestly? she's giving math girlie main character energy and I need you to know about her. ✨

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🎀 NAME 🎀

ccosh, ccoshf, ccoshl — complex hyperbolic cosine. three little besties, one job. 💅

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📚 LIBRARY 📚

Math library, aka libm, and you get to her with -lm when you link. yes you have to actually link her, she's not gonna just show up. 🫶

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✨ SYNOPSIS ✨

#include <complex.h>

double complex ccosh(double complex z);
float complex ccoshf(float complex z);
long double complex ccoshl(long double complex z);

look at them. three sisters. double, float, long double. choose your own adventure,z is a complex number every single time. no cap. 🌸

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🦋 DESCRIPTION 🦋

okay so what these functions do is they calculate the complex hyperbolic cosine of z. that's it. that's the whole job. and they ate, lowkey. 🔥

the complex hyperbolic cosine function is defined as:

ccosh(z) = (exp(z)+exp(-z))/2

so like, you take z, you take negative z, you exp both of them, you add them up, you divide by two. symmetric. balanced. iconic. periodt. 💜

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👑 STANDARDS 👑

C11, POSIX.1-2008. she's certified bestie, she follows the rules. ⭐

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🌈 HISTORY 🌈

glibc 2.1 — that's when she first showed up. and then C99, POSIX.1-2001. so she's been around a minute and she's still thriving. not me being obsessed with a legacy function 😭

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🔥 SEE ALSO 🔥

• cabs(3) — absolute value, the magnitude girlie
• cacosh(3) — the inverse, she un-does what this one does
• csinh(3) — hyperbolic sine, the sibling
• ctanh(3) — hyperbolic tangent, the other sibling
• complex(7) — the whole complex number situation, go read it fr fr

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💀 reminder bestie: none of these functions are gonna magically appear in your binary. link with -lm or you're gonna have a bad time. 🙈

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okay that's the whole page!! this came from Linux man-pages 6.20, dated 2026-02-08, and it's the ccosh(3) page 💖 slay safe out there, go compute some hyperbolic cosines, love u bye 🎀✨🦋