ccosf, ccos, ccosl

Defined in header `<complex.h>`
float complex ccosf( float complex z );	(1)	(since C99)
double complex ccos( double complex z );	(2)	(since C99)
long double complex ccosl( long double complex z );	(3)	(since C99)
Defined in header `<tgmath.h>`
#define cos( z )	(4)	(since C99)

1-3) Computes the complex cosine of z.

4) Type-generic macro: If z has type long double complex, ccosl is called. if z has type double complex, ccos is called, if z has type float complex, ccosf is called. If z is real or integer, then the macro invokes the corresponding real function (cosf, cos, cosl). If z is imaginary, then the macro invokes the corresponding real version of the function cosh, implementing the formula

cos(iy) = cosh(y)

, and the return type is real.

Parameters

z

-

complex argument

Return value

If no errors occur, the complex cosine of z is returned.

Errors and special cases are handled as if the operation is implemented by ccosh(I*z).

Notes

The cosine is an entire function on the complex plane, and has no branch cuts.

Mathematical definition of the cosine is

cos z = e iz +e -iz 2

Language
headers
Type support
Dynamic memory management
Error handling
Program utilities
Variadic function support
Date and time utilities
Strings library
Algorithms
Numerics
Input/output support
Localization support
Thread support (C11)
Atomic operations (C11)
Technical Specifications

Common mathematical functions
Floating-point environment
Complex number arithmetics
Random number generation
Type-generic math