\[\left(-x \cdot \frac{1}{\tan B}\right) + \frac{F}{\sin B} \cdot {\left(\left(F \cdot F + 2\right) + 2 \cdot x\right)}^{\left(-\frac{1}{2}\right)}\]

\left(-x \cdot \frac{1}{\tan B}\right) + \frac{F}{\sin B} \cdot {\left(\left(F \cdot F + 2\right) + 2 \cdot x\right)}^{\left(-\frac{1}{2}\right)}

double f(double F, double B, double x) {
        double r8103 = x;
        double r8104 = 1.0;
        double r8105 = B;
        double r8106 = tan(r8105);
        double r8107 = r8104 / r8106;
        double r8108 = r8103 * r8107;
        double r8109 = -r8108;
        double r8110 = F;
        double r8111 = sin(r8105);
        double r8112 = r8110 / r8111;
        double r8113 = r8110 * r8110;
        double r8114 = 2.0;
        double r8115 = r8113 + r8114;
        double r8116 = r8114 * r8103;
        double r8117 = r8115 + r8116;
        double r8118 = r8104 / r8114;
        double r8119 = -r8118;
        double r8120 = pow(r8117, r8119);
        double r8121 = r8112 * r8120;
        double r8122 = r8109 + r8121;
        return r8122;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019179 
(FPCore (F B x)
  :name "VandenBroeck and Keller, Equation (23)"
  (+ (- (* x (/ 1.0 (tan B)))) (* (/ F (sin B)) (pow (+ (+ (* F F) 2.0) (* 2.0 x)) (- (/ 1.0 2.0))))))

Backtrace

result arity mismatch; expected number of values not received expected: 2 received: 1 in: local-binding form values...: 0		L	C
loop	/data/pavpan/nightlies/herbie/various-cleanup/src/core/extraction.rkt	25	2
(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-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