Average Error: 0.0 → 0.0
Time: 3.2s
Precision: binary64
Cost: 13440
\[\log \left(\frac{1}{x} + \frac{\sqrt{1 - x \cdot x}}{x}\right) \]
↓
\[-\log \left(\frac{x}{1 + \sqrt{1 - x \cdot x}}\right) \]
(FPCore (x)
 :precision binary64
 (log (+ (/ 1.0 x) (/ (sqrt (- 1.0 (* x x))) x))))
↓
(FPCore (x) :precision binary64 (- (log (/ x (+ 1.0 (sqrt (- 1.0 (* x x))))))))
double code(double x) {
	return log(((1.0 / x) + (sqrt((1.0 - (x * x))) / x)));
}
↓
double code(double x) {
	return -log((x / (1.0 + sqrt((1.0 - (x * x))))));
}

real(8) function code(x)
    real(8), intent (in) :: x
    code = log(((1.0d0 / x) + (sqrt((1.0d0 - (x * x))) / x)))
end function
↓
real(8) function code(x)
    real(8), intent (in) :: x
    code = -log((x / (1.0d0 + sqrt((1.0d0 - (x * x))))))
end function

public static double code(double x) {
	return Math.log(((1.0 / x) + (Math.sqrt((1.0 - (x * x))) / x)));
}
↓
public static double code(double x) {
	return -Math.log((x / (1.0 + Math.sqrt((1.0 - (x * x))))));
}

def code(x):
	return math.log(((1.0 / x) + (math.sqrt((1.0 - (x * x))) / x)))
↓
def code(x):
	return -math.log((x / (1.0 + math.sqrt((1.0 - (x * x))))))

function code(x)
	return log(Float64(Float64(1.0 / x) + Float64(sqrt(Float64(1.0 - Float64(x * x))) / x)))
end
↓
function code(x)
	return Float64(-log(Float64(x / Float64(1.0 + sqrt(Float64(1.0 - Float64(x * x)))))))
end

function tmp = code(x)
	tmp = log(((1.0 / x) + (sqrt((1.0 - (x * x))) / x)));
end
↓
function tmp = code(x)
	tmp = -log((x / (1.0 + sqrt((1.0 - (x * x))))));
end

code[x_] := N[Log[N[(N[(1.0 / x), $MachinePrecision] + N[(N[Sqrt[N[(1.0 - N[(x * x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision] / x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]
↓
code[x_] := (-N[Log[N[(x / N[(1.0 + N[Sqrt[N[(1.0 - N[(x * x), $MachinePrecision]), $MachinePrecision]], $MachinePrecision]), $MachinePrecision]), $MachinePrecision]], $MachinePrecision])

\log \left(\frac{1}{x} + \frac{\sqrt{1 - x \cdot x}}{x}\right)
↓
-\log \left(\frac{x}{1 + \sqrt{1 - x \cdot x}}\right)

Error

Try it out

Your Program's Arguments

Results

Enter valid numbers for all inputs

Derivation

  1. Initial program 0.0

    \[\log \left(\frac{1}{x} + \frac{\sqrt{1 - x \cdot x}}{x}\right) \]

  2. Applied egg-rr0.1

    \[\leadsto \log \color{blue}{\left(e^{\mathsf{log1p}\left(\frac{1}{x} + \frac{\sqrt{1 - x \cdot x}}{x}\right)} - 1\right)} \]

  3. Simplified0.0

    \[\leadsto \log \color{blue}{\left(\frac{1 + \sqrt{1 - x \cdot x}}{x}\right)} \]
    Proof
    (/.f64 (+.f64 1 (sqrt.f64 (-.f64 1 (*.f64 x x)))) x): 0 points increase in error, 0 points decrease in error
    (/.f64 (Rewrite=> +-commutative_binary64 (+.f64 (sqrt.f64 (-.f64 1 (*.f64 x x))) 1)) x): 0 points increase in error, 0 points decrease in error
    (/.f64 (Rewrite<= *-rgt-identity_binary64 (*.f64 (+.f64 (sqrt.f64 (-.f64 1 (*.f64 x x))) 1) 1)) x): 0 points increase in error, 0 points decrease in error
    (Rewrite<= associate-*r/_binary64 (*.f64 (+.f64 (sqrt.f64 (-.f64 1 (*.f64 x x))) 1) (/.f64 1 x))): 2 points increase in error, 0 points decrease in error
    (Rewrite<= distribute-rgt1-in_binary64 (+.f64 (/.f64 1 x) (*.f64 (sqrt.f64 (-.f64 1 (*.f64 x x))) (/.f64 1 x)))): 2 points increase in error, 1 points decrease in error
    (+.f64 (/.f64 1 x) (Rewrite=> associate-*r/_binary64 (/.f64 (*.f64 (sqrt.f64 (-.f64 1 (*.f64 x x))) 1) x))): 0 points increase in error, 0 points decrease in error
    (+.f64 (/.f64 1 x) (/.f64 (Rewrite=> *-rgt-identity_binary64 (sqrt.f64 (-.f64 1 (*.f64 x x)))) x)): 0 points increase in error, 0 points decrease in error
    (Rewrite<= expm1-log1p_binary64 (expm1.f64 (log1p.f64 (+.f64 (/.f64 1 x) (/.f64 (sqrt.f64 (-.f64 1 (*.f64 x x))) x))))): 132 points increase in error, 119 points decrease in error
    (Rewrite<= expm1-def_binary64 (-.f64 (exp.f64 (log1p.f64 (+.f64 (/.f64 1 x) (/.f64 (sqrt.f64 (-.f64 1 (*.f64 x x))) x)))) 1)): 8 points increase in error, 11 points decrease in error

  4. Applied egg-rr0.0

    \[\leadsto \color{blue}{-\log \left(\frac{\frac{x}{1 + \sqrt{1 - x \cdot x}}}{1}\right)} \]

  5. Final simplification0.0

    \[\leadsto -\log \left(\frac{x}{1 + \sqrt{1 - x \cdot x}}\right) \]

Alternatives

Alternative 1
Error0.0
Cost13376
\[\log \left(\frac{1 + \sqrt{1 - x \cdot x}}{x}\right) \]
Alternative 2
Error0.3
Cost6976
\[\log \left(x \cdot -0.5 + 2 \cdot \frac{1}{x}\right) \]
Alternative 3
Error0.6
Cost6592
\[\log \left(\frac{2}{x}\right) \]

Error

Reproduce

herbie shell --seed 2022338 
(FPCore (x)
  :name "Hyperbolic arc-(co)secant"
  :precision binary64
  (log (+ (/ 1.0 x) (/ (sqrt (- 1.0 (* x x))) x))))