Average Error: 0.0 → 0.0
Time: 2.4m
Precision: 64
Internal Precision: 576
\[\Re(\left(\frac{e^{x} + e^{-x}}{2} \cdot \cos y + \frac{e^{x} - e^{-x}}{2} \cdot \sin y i\right))\]
\[\frac{(\left(\cos y\right) \cdot \left(e^{x}\right) + \left(\frac{\frac{\cos y}{\sqrt{e^{x}}}}{{e}^{\left(\frac{x}{2}\right)}}\right))_*}{2}\]

Error

Bits error versus x

Bits error versus y

Derivation

  1. Initial program 0.0

    \[\Re(\left(\frac{e^{x} + e^{-x}}{2} \cdot \cos y + \frac{e^{x} - e^{-x}}{2} \cdot \sin y i\right))\]
  2. Simplified0.0

    \[\leadsto \color{blue}{\frac{(\left(\cos y\right) \cdot \left(e^{x}\right) + \left(\frac{\cos y}{e^{x}}\right))_*}{2}}\]
  3. Using strategy rm
  4. Applied add-sqr-sqrt0.0

    \[\leadsto \frac{(\left(\cos y\right) \cdot \left(e^{x}\right) + \left(\frac{\cos y}{\color{blue}{\sqrt{e^{x}} \cdot \sqrt{e^{x}}}}\right))_*}{2}\]
  5. Applied associate-/r*0.0

    \[\leadsto \frac{(\left(\cos y\right) \cdot \left(e^{x}\right) + \color{blue}{\left(\frac{\frac{\cos y}{\sqrt{e^{x}}}}{\sqrt{e^{x}}}\right)})_*}{2}\]
  6. Using strategy rm
  7. Applied *-un-lft-identity0.0

    \[\leadsto \frac{(\left(\cos y\right) \cdot \left(e^{x}\right) + \left(\frac{\frac{\cos y}{\sqrt{e^{x}}}}{\sqrt{e^{\color{blue}{1 \cdot x}}}}\right))_*}{2}\]
  8. Applied exp-prod0.0

    \[\leadsto \frac{(\left(\cos y\right) \cdot \left(e^{x}\right) + \left(\frac{\frac{\cos y}{\sqrt{e^{x}}}}{\sqrt{\color{blue}{{\left(e^{1}\right)}^{x}}}}\right))_*}{2}\]
  9. Applied sqrt-pow10.0

    \[\leadsto \frac{(\left(\cos y\right) \cdot \left(e^{x}\right) + \left(\frac{\frac{\cos y}{\sqrt{e^{x}}}}{\color{blue}{{\left(e^{1}\right)}^{\left(\frac{x}{2}\right)}}}\right))_*}{2}\]
  10. Simplified0.0

    \[\leadsto \frac{(\left(\cos y\right) \cdot \left(e^{x}\right) + \left(\frac{\frac{\cos y}{\sqrt{e^{x}}}}{{\color{blue}{e}}^{\left(\frac{x}{2}\right)}}\right))_*}{2}\]
  11. Final simplification0.0

    \[\leadsto \frac{(\left(\cos y\right) \cdot \left(e^{x}\right) + \left(\frac{\frac{\cos y}{\sqrt{e^{x}}}}{{e}^{\left(\frac{x}{2}\right)}}\right))_*}{2}\]

Reproduce

herbie shell --seed 2019090 +o rules:numerics
(FPCore (x y)
  :name "Euler formula real part (p55)"
  (re (complex (* (/ (+ (exp x) (exp (- x))) 2) (cos y)) (* (/ (- (exp x) (exp (- x))) 2) (sin y)))))