ctan.c File Reference

#include "prim.h"

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Functions
complex	ctan (complex z)
	Tangent of a complex number. More...

Function Documentation

ctan()

complex ctan

(

complex

z

)

Tangent of a complex number.

Calculated as in Open Office:
https://wiki.openoffice.org/wiki/Documentation/How_Tos/Calc:_IMTAN_function

a+bi
               sin(2.0 * a)
real  = ---------------------------—
         cos(2.0 * a) + cosh(2.0 * b)
  sinh(2.0 * b)

imag  = ---------------------------—
         cos(2.0 * a) + cosh(2.0 * b)

Definition at line 55 of file ctan.c.

References cimag(), cos(), cosh(), cpack(), creal(), sin(), and sinh().

Referenced by ComplexNumber::Tangent().

{
    complex w;
    double a, b;
    double d;

    a = creal(z);
    b = cimag(z);
    d = cos(2.0 * a) + cosh(2.0 * b);

    if (d == 0.0)
    {
        w = cpack((double)INFP, (double)INFP);
    }
    else
    {
        w = cpack((sin(2.0 * a) / d), (sinh(2.0 * b) / d));
    }

    return w;
}

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