3.1.46 \(\int \frac {1-2 x^2}{1+3 x^2+4 x^4} \, dx\)

Optimal. Leaf size=29 \[ \frac {1}{2} \log \left (2 x^2+x+1\right )-\frac {1}{2} \log \left (2 x^2-x+1\right ) \]

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Rubi [A]  time = 0.02, antiderivative size = 29, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, integrand size = 22, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.091, Rules used = {1164, 628} \begin {gather*} \frac {1}{2} \log \left (2 x^2+x+1\right )-\frac {1}{2} \log \left (2 x^2-x+1\right ) \end {gather*}

Antiderivative was successfully verified.

[In]

Int[(1 - 2*x^2)/(1 + 3*x^2 + 4*x^4),x]

[Out]

-Log[1 - x + 2*x^2]/2 + Log[1 + x + 2*x^2]/2

Rule 628

Int[((d_) + (e_.)*(x_))/((a_.) + (b_.)*(x_) + (c_.)*(x_)^2), x_Symbol] :> Simp[(d*Log[RemoveContent[a + b*x +
c*x^2, x]])/b, x] /; FreeQ[{a, b, c, d, e}, x] && EqQ[2*c*d - b*e, 0]

Rule 1164

Int[((d_) + (e_.)*(x_)^2)/((a_) + (b_.)*(x_)^2 + (c_.)*(x_)^4), x_Symbol] :> With[{q = Rt[(-2*d)/e - b/c, 2]},
Dist[e/(2*c*q), Int[(q - 2*x)/Simp[d/e + q*x - x^2, x], x], x] + Dist[e/(2*c*q), Int[(q + 2*x)/Simp[d/e - q*x
- x^2, x], x], x]] /; FreeQ[{a, b, c, d, e}, x] && NeQ[b^2 - 4*a*c, 0] && EqQ[c*d^2 - a*e^2, 0] &&  !GtQ[b^2
- 4*a*c, 0]

Rubi steps

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

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Mathematica [A]  time = 0.01, size = 29, normalized size = 1.00 \begin {gather*} \frac {1}{2} \log \left (2 x^2+x+1\right )-\frac {1}{2} \log \left (2 x^2-x+1\right ) \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[(1 - 2*x^2)/(1 + 3*x^2 + 4*x^4),x]

[Out]

-1/2*Log[1 - x + 2*x^2] + Log[1 + x + 2*x^2]/2

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

Verification is not applicable to the result.

[In]

IntegrateAlgebraic[(1 - 2*x^2)/(1 + 3*x^2 + 4*x^4),x]

[Out]

IntegrateAlgebraic[(1 - 2*x^2)/(1 + 3*x^2 + 4*x^4), x]

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fricas [A]  time = 0.87, size = 25, normalized size = 0.86 \begin {gather*} \frac {1}{2} \, \log \left (2 \, x^{2} + x + 1\right ) - \frac {1}{2} \, \log \left (2 \, x^{2} - x + 1\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

1/2*log(2*x^2 + x + 1) - 1/2*log(2*x^2 - x + 1)

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giac [A]  time = 0.15, size = 25, normalized size = 0.86 \begin {gather*} \frac {1}{2} \, \log \left (2 \, x^{2} + x + 1\right ) - \frac {1}{2} \, \log \left (2 \, x^{2} - x + 1\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

1/2*log(2*x^2 + x + 1) - 1/2*log(2*x^2 - x + 1)

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maple [A]  time = 0.00, size = 26, normalized size = 0.90 \begin {gather*} -\frac {\ln \left (2 x^{2}-x +1\right )}{2}+\frac {\ln \left (2 x^{2}+x +1\right )}{2} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-1/2*ln(2*x^2-x+1)+1/2*ln(2*x^2+x+1)

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maxima [A]  time = 1.00, size = 25, normalized size = 0.86 \begin {gather*} \frac {1}{2} \, \log \left (2 \, x^{2} + x + 1\right ) - \frac {1}{2} \, \log \left (2 \, x^{2} - x + 1\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

1/2*log(2*x^2 + x + 1) - 1/2*log(2*x^2 - x + 1)

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mupad [B]  time = 0.06, size = 12, normalized size = 0.41 \begin {gather*} \mathrm {atanh}\left (\frac {x}{2\,x^2+1}\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

atanh(x/(2*x^2 + 1))

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sympy [A]  time = 0.11, size = 26, normalized size = 0.90 \begin {gather*} - \frac {\log {\left (x^{2} - \frac {x}{2} + \frac {1}{2} \right )}}{2} + \frac {\log {\left (x^{2} + \frac {x}{2} + \frac {1}{2} \right )}}{2} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-log(x**2 - x/2 + 1/2)/2 + log(x**2 + x/2 + 1/2)/2

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