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

\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 r49404 = x;
        double r49405 = exp(r49404);
        double r49406 = -r49404;
        double r49407 = exp(r49406);
        double r49408 = r49405 + r49407;
        double r49409 = 2.0;
        double r49410 = r49408 / r49409;
        double r49411 = y;
        double r49412 = cos(r49411);
        double r49413 = r49410 * r49412;
        double r49414 = r49405 - r49407;
        double r49415 = r49414 / r49409;
        double r49416 = sin(r49411);
        double r49417 = r49415 * r49416;
        double r49418 = /* ERROR: no complex support in C */;
        double r49419 = /* ERROR: no complex support in C */;
        return r49419;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019323 
(FPCore (x y)
  :name "Euler formula imaginary part (p55)"
  :precision binary64
  (im (complex (* (/ (+ (exp x) (exp (- x))) 2) (cos y)) (* (/ (- (exp x) (exp (- x))) 2) (sin y)))))

Backtrace

dict-ref: no value for key: 'branch49403 in: '((x . binary64) (y . binary64))		L	C
for-loop	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/points.rkt	106	4
make-sampler	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/points.rkt	99	0
prepare-points	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/points.rkt	158	0
for-loop	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/core/regimes.rkt	233	9
sindices->spoints	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/core/regimes.rkt	194	0
f33	/opt/racket-7.2/collects/racket/match/compiler.rkt	507	40
get-final-combination	/data/pavpan/nightlies/herbie/fix-interface-bugs/src/mainloop.rkt	369	0
(unnamed)	/opt/racket-7.2/collects/racket/private/more-scheme.rkt	261	28
run	/opt/racket-7.2/share/pkgs/profile-lib/main.rkt	39	2
profile-thunk16	/opt/racket-7.2/share/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/opt/racket-7.2/collects/racket/private/more-scheme.rkt	261	28