{\left(a \cdot \sin \left(\frac{angle}{180} \cdot \pi\right)\right)}^{2} + {\left(b \cdot \cos \left(\frac{angle}{180} \cdot \pi\right)\right)}^{2}
\begin{array}{l}
t_0 := \sqrt[3]{\sqrt[3]{angle}}\\
{\left(a \cdot \sin \left(0.005555555555555556 \cdot \left(angle \cdot \pi\right)\right)\right)}^{2} + {\left(b \cdot \cos \left(\frac{t_0 \cdot \left(\sqrt[3]{angle} \cdot \left(t_0 \cdot t_0\right)\right)}{\sqrt{180}} \cdot \left(\pi \cdot \frac{\sqrt[3]{angle}}{\sqrt{180}}\right)\right)\right)}^{2}
\end{array}
(FPCore (a b angle) :precision binary64 (+ (pow (* a (sin (* (/ angle 180.0) PI))) 2.0) (pow (* b (cos (* (/ angle 180.0) PI))) 2.0)))
(FPCore (a b angle)
:precision binary64
(let* ((t_0 (cbrt (cbrt angle))))
(+
(pow (* a (sin (* 0.005555555555555556 (* angle PI)))) 2.0)
(pow
(*
b
(cos
(*
(/ (* t_0 (* (cbrt angle) (* t_0 t_0))) (sqrt 180.0))
(* PI (/ (cbrt angle) (sqrt 180.0))))))
2.0))))double code(double a, double b, double angle) {
return pow((a * sin((angle / 180.0) * ((double) M_PI))), 2.0) + pow((b * cos((angle / 180.0) * ((double) M_PI))), 2.0);
}
double code(double a, double b, double angle) {
double t_0 = cbrt(cbrt(angle));
return pow((a * sin(0.005555555555555556 * (angle * ((double) M_PI)))), 2.0) + pow((b * cos(((t_0 * (cbrt(angle) * (t_0 * t_0))) / sqrt(180.0)) * (((double) M_PI) * (cbrt(angle) / sqrt(180.0))))), 2.0);
}



Bits error versus a



Bits error versus b



Bits error versus angle
Results
Initial program 20.7
Applied add-sqr-sqrt_binary6420.7
Applied add-cube-cbrt_binary6420.7
Applied times-frac_binary6420.7
Applied associate-*l*_binary6420.7
Taylor expanded in angle around inf 20.7
Applied add-cube-cbrt_binary6420.7
Applied associate-*r*_binary6420.7
Final simplification20.7
herbie shell --seed 2021313
(FPCore (a b angle)
:name "ab-angle->ABCF A"
:precision binary64
(+ (pow (* a (sin (* (/ angle 180.0) PI))) 2.0) (pow (* b (cos (* (/ angle 180.0) PI))) 2.0)))