\[\Im(\left(\frac{e^{x} + e^{-x}}{2} \cdot \cos y + \frac{e^{x} - e^{-x}}{2} \cdot \sin y i\right))\]

\Im(\left(\frac{e^{x} + e^{-x}}{2} \cdot \cos y + \frac{e^{x} - e^{-x}}{2} \cdot \sin y i\right))

double f(double x, double y) {
        double r8061 = x;
        double r8062 = exp(r8061);
        double r8063 = -r8061;
        double r8064 = exp(r8063);
        double r8065 = r8062 + r8064;
        double r8066 = 2.0;
        double r8067 = r8065 / r8066;
        double r8068 = y;
        double r8069 = cos(r8068);
        double r8070 = r8067 * r8069;
        double r8071 = r8062 - r8064;
        double r8072 = r8071 / r8066;
        double r8073 = sin(r8068);
        double r8074 = r8072 * r8073;
        double r8075 = /* ERROR: no complex support in C */;
        double r8076 = /* ERROR: no complex support in C */;
        return r8076;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019191 
(FPCore (x y)
  :name "Euler formula imaginary part (p55)"
  (im (complex (* (/ (+ (exp x) (exp (- x))) 2.0) (cos y)) (* (/ (- (exp x) (exp (- x))) 2.0) (sin y)))))

Backtrace

get-representation: Unknown representation #f		L	C
filter-p&e	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	256	0
loop	/data/pavpan/nightlies/herbie/interface2/src/points.rkt	284	2
setup-prog!34	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	67	0
run-improve43	/data/pavpan/nightlies/herbie/interface2/src/mainloop.rkt	339	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28
run	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.0/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.0/collects/racket/private/more-scheme.rkt	261	28