3.1.36 \(\int \frac {1}{\sqrt {3-2 x^2-2 x^4}} \, dx\) [36]

Optimal. Leaf size=42 \[ \frac {F\left (\sin ^{-1}\left (\sqrt {\frac {2}{-1+\sqrt {7}}} x\right )|\frac {1}{3} \left (-4+\sqrt {7}\right )\right )}{\sqrt {1+\sqrt {7}}} \]

[Out]

EllipticF(x*2^(1/2)/(-1+7^(1/2))^(1/2),1/6*I*42^(1/2)-1/6*I*6^(1/2))/(1+7^(1/2))^(1/2)

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Rubi [A]
time = 0.03, antiderivative size = 42, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 2, integrand size = 16, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.125, Rules used = {1109, 430} \begin {gather*} \frac {F\left (\text {ArcSin}\left (\sqrt {\frac {2}{-1+\sqrt {7}}} x\right )|\frac {1}{3} \left (-4+\sqrt {7}\right )\right )}{\sqrt {1+\sqrt {7}}} \end {gather*}

Antiderivative was successfully verified.

[In]

Int[1/Sqrt[3 - 2*x^2 - 2*x^4],x]

[Out]

EllipticF[ArcSin[Sqrt[2/(-1 + Sqrt[7])]*x], (-4 + Sqrt[7])/3]/Sqrt[1 + Sqrt[7]]

Rule 430

Int[1/(Sqrt[(a_) + (b_.)*(x_)^2]*Sqrt[(c_) + (d_.)*(x_)^2]), x_Symbol] :> Simp[(1/(Sqrt[a]*Sqrt[c]*Rt[-d/c, 2]
))*EllipticF[ArcSin[Rt[-d/c, 2]*x], b*(c/(a*d))], x] /; FreeQ[{a, b, c, d}, x] && NegQ[d/c] && GtQ[c, 0] && Gt
Q[a, 0] &&  !(NegQ[b/a] && SimplerSqrtQ[-b/a, -d/c])

Rule 1109

Int[1/Sqrt[(a_) + (b_.)*(x_)^2 + (c_.)*(x_)^4], x_Symbol] :> With[{q = Rt[b^2 - 4*a*c, 2]}, Dist[2*Sqrt[-c], I
nt[1/(Sqrt[b + q + 2*c*x^2]*Sqrt[-b + q - 2*c*x^2]), x], x]] /; FreeQ[{a, b, c}, x] && GtQ[b^2 - 4*a*c, 0] &&
LtQ[c, 0]

Rubi steps

\begin {align*} \int \frac {1}{\sqrt {3-2 x^2-2 x^4}} \, dx &=\left (2 \sqrt {2}\right ) \int \frac {1}{\sqrt {-2+2 \sqrt {7}-4 x^2} \sqrt {2+2 \sqrt {7}+4 x^2}} \, dx\\ &=\frac {F\left (\sin ^{-1}\left (\sqrt {\frac {2}{-1+\sqrt {7}}} x\right )|\frac {1}{3} \left (-4+\sqrt {7}\right )\right )}{\sqrt {1+\sqrt {7}}}\\ \end {align*}

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Mathematica [C] Result contains complex when optimal does not.
time = 10.04, size = 51, normalized size = 1.21 \begin {gather*} -\frac {i F\left (i \sinh ^{-1}\left (\sqrt {\frac {2}{1+\sqrt {7}}} x\right )|-\frac {4}{3}-\frac {\sqrt {7}}{3}\right )}{\sqrt {-1+\sqrt {7}}} \end {gather*}

Warning: Unable to verify antiderivative.

[In]

Integrate[1/Sqrt[3 - 2*x^2 - 2*x^4],x]

[Out]

((-I)*EllipticF[I*ArcSinh[Sqrt[2/(1 + Sqrt[7])]*x], -4/3 - Sqrt[7]/3])/Sqrt[-1 + Sqrt[7]]

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Maple [B] Both result and optimal contain complex but leaf count of result is larger than twice the leaf count of optimal. 83 vs. \(2 (34 ) = 68\).
time = 0.06, size = 84, normalized size = 2.00

method	result	size
default	\(\frac {3 \sqrt {1-\left (\frac {\sqrt {7}}{3}+\frac {1}{3}\right ) x^{2}}\, \sqrt {1-\left (\frac {1}{3}-\frac {\sqrt {7}}{3}\right ) x^{2}}\, \EllipticF \left (\frac {x \sqrt {3+3 \sqrt {7}}}{3}, \frac {i \sqrt {42}}{6}-\frac {i \sqrt {6}}{6}\right )}{\sqrt {3+3 \sqrt {7}}\, \sqrt {-2 x^{4}-2 x^{2}+3}}\)	\(84\)
elliptic	\(\frac {3 \sqrt {1-\left (\frac {\sqrt {7}}{3}+\frac {1}{3}\right ) x^{2}}\, \sqrt {1-\left (\frac {1}{3}-\frac {\sqrt {7}}{3}\right ) x^{2}}\, \EllipticF \left (\frac {x \sqrt {3+3 \sqrt {7}}}{3}, \frac {i \sqrt {42}}{6}-\frac {i \sqrt {6}}{6}\right )}{\sqrt {3+3 \sqrt {7}}\, \sqrt {-2 x^{4}-2 x^{2}+3}}\)	\(84\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(-2*x^4-2*x^2+3)^(1/2),x,method=_RETURNVERBOSE)

[Out]

3/(3+3*7^(1/2))^(1/2)*(1-(1/3*7^(1/2)+1/3)*x^2)^(1/2)*(1-(1/3-1/3*7^(1/2))*x^2)^(1/2)/(-2*x^4-2*x^2+3)^(1/2)*E
llipticF(1/3*x*(3+3*7^(1/2))^(1/2),1/6*I*42^(1/2)-1/6*I*6^(1/2))

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Maxima [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {Failed to integrate} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(-2*x^4-2*x^2+3)^(1/2),x, algorithm="maxima")

[Out]

integrate(1/sqrt(-2*x^4 - 2*x^2 + 3), x)

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Fricas [A]
time = 0.09, size = 35, normalized size = 0.83 \begin {gather*} \frac {1}{6} \, \sqrt {\sqrt {7} + 1} {\left (\sqrt {7} - 1\right )} {\rm ellipticF}\left (\frac {1}{3} \, \sqrt {3} x \sqrt {\sqrt {7} + 1}, \frac {1}{3} \, \sqrt {7} - \frac {4}{3}\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(-2*x^4-2*x^2+3)^(1/2),x, algorithm="fricas")

[Out]

1/6*sqrt(sqrt(7) + 1)*(sqrt(7) - 1)*ellipticF(1/3*sqrt(3)*x*sqrt(sqrt(7) + 1), 1/3*sqrt(7) - 4/3)

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Sympy [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \int \frac {1}{\sqrt {- 2 x^{4} - 2 x^{2} + 3}}\, dx \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(-2*x**4-2*x**2+3)**(1/2),x)

[Out]

Integral(1/sqrt(-2*x**4 - 2*x**2 + 3), x)

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Giac [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {could not integrate} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(-2*x^4-2*x^2+3)^(1/2),x, algorithm="giac")

[Out]

integrate(1/sqrt(-2*x^4 - 2*x^2 + 3), x)

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Mupad [F]
time = 0.00, size = -1, normalized size = -0.02 \begin {gather*} \int \frac {1}{\sqrt {-2\,x^4-2\,x^2+3}} \,d x \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(3 - 2*x^4 - 2*x^2)^(1/2),x)

[Out]

int(1/(3 - 2*x^4 - 2*x^2)^(1/2), x)

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