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NAME
     cplxtrig - trigonometric functions in the C++ complex number
     math library

SYNOPSIS
     #include <complex.h>
     class complex {
     public:
          friend complex cos(const complex);
          friend complex sin(const complex);
          friend complex tan(const complex);
          friend complex cosh(const complex);
          friend complex sinh(const complex);
          friend complex tanh(const complex);
          friend complex acos(const complex);
          friend complex asin(const complex);
          friend complex atan(const complex);
          ... // remainder not shown here
     };

DESCRIPTION
     These functions are versions of the corresponding  floating-
     point  trigonometric  math library functions, overloaded for
     use with complex numbers.

     complex z = cos(x)
          Returns the complex cosine of complex angle x.

     complex z = sin(x)
          Returns the complex sine of complex angle x.

     complex z = tan(x)
          Returns the complex tangent of complex angle x.

     complex z = cosh(x)
          Returns the complex hyperbolic cosine of complex  angle
          x.

     complex z = sinh(x)
          Returns the complex hyperbolic sine of complex angle x.

     complex z = tanh(x)
          Returns the complex hyperbolic tangent of complex angle
          x.

     complex z = acos(x)
          Returns the complex angle whose cosine is complex x.

     complex z = asin(x)
          Returns the complex angle whose sine is complex x.

     complex z = atan(x)
          Returns the complex angle whose tangent is complex x.

SEE ALSO
     cplx.intro(3C++), cartpol(3C++), cplxerr(3C++),
     cplxexp(3C++), cplxops(3C++), intro(2), C++ Library Refer-
     ence Manual, Chapter 3, "The Complex Arithmetic Library."

DIAGNOSTICS
     sinh(x) and cosh(x)
          If the  imaginary  part  of  x  would  cause  overflow,
          returns  (0,0).   If  the  real part is large enough to
          cause overflow, returns a value depending on  the  sine
          and  cosine  of  the imaginary part of x:  allbox; ccn.
          x.imag()  x.imag()  returned                      value
          sin>=0    cos>=0    (HUGE_VAL,      HUGE_VAL)      sin<
          0    cos>=0    (HUGE_VAL,   -HUGE_VAL)   sin>=0    cos<
          0    (-HUGE_VAL,      HUGE_VAL)      sin<     0    cos<
          0    (-HUGE_VAL, -HUGE_VAL) In all cases, errno is  set
          to ERANGE (see intro(2)).  See also cplxerr(3C++).

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