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

\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 r6319219 = x;
        double r6319220 = exp(r6319219);
        double r6319221 = -r6319219;
        double r6319222 = exp(r6319221);
        double r6319223 = r6319220 + r6319222;
        double r6319224 = 2.0;
        double r6319225 = r6319223 / r6319224;
        double r6319226 = y;
        double r6319227 = cos(r6319226);
        double r6319228 = r6319225 * r6319227;
        double r6319229 = r6319220 - r6319222;
        double r6319230 = r6319229 / r6319224;
        double r6319231 = sin(r6319226);
        double r6319232 = r6319230 * r6319231;
        double r6319233 = /* ERROR: no complex support in C */;
        double r6319234 = /* ERROR: no complex support in C */;
        return r6319234;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019173 
(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

hash-ref: no value found for key key: #<enode 1753(1753)>		L	C
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	197	2
extractor-extract	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	196	0
(unnamed)	/data/pavpan/nightlies/herbie/various-cleanup/src/core/simplify.rkt	26	0
simplify!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	217	0
run-iter!	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	320	0
for-loop	/data/pavpan/nightlies/herbie/various-cleanup/src/mainloop.rkt	354	4
run-improve43	/data/pavpan/nightlies/herbie/various-cleanup/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