\[\frac{1 - 5 \cdot \left(v \cdot v\right)}{\left(\left(\pi \cdot t\right) \cdot \sqrt{2 \cdot \left(1 - 3 \cdot \left(v \cdot v\right)\right)}\right) \cdot \left(1 - v \cdot v\right)}\]

\frac{1 - 5 \cdot \left(v \cdot v\right)}{\left(\left(\pi \cdot t\right) \cdot \sqrt{2 \cdot \left(1 - 3 \cdot \left(v \cdot v\right)\right)}\right) \cdot \left(1 - v \cdot v\right)}

double f(double v, double t) {
        double r8294 = 1.0;
        double r8295 = 5.0;
        double r8296 = v;
        double r8297 = r8296 * r8296;
        double r8298 = r8295 * r8297;
        double r8299 = r8294 - r8298;
        double r8300 = atan2(1.0, 0.0);
        double r8301 = t;
        double r8302 = r8300 * r8301;
        double r8303 = 2.0;
        double r8304 = 3.0;
        double r8305 = r8304 * r8297;
        double r8306 = r8294 - r8305;
        double r8307 = r8303 * r8306;
        double r8308 = sqrt(r8307);
        double r8309 = r8302 * r8308;
        double r8310 = r8294 - r8297;
        double r8311 = r8309 * r8310;
        double r8312 = r8299 / r8311;
        return r8312;
}

Reproduce

Please include this information when filing a bug report:

herbie shell --seed 2019179 
(FPCore (v t)
  :name "Falkner and Boettcher, Equation (20:1,3)"
  (/ (- 1.0 (* 5.0 (* v v))) (* (* (* PI t) (sqrt (* 2.0 (- 1.0 (* 3.0 (* v v)))))) (- 1.0 (* v v)))))

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