3.3.56 \(\int \frac {1}{\sqrt {1+x^2} (2+x^2)^2} \, dx\) [256]

Optimal. Leaf size=48 \[ -\frac {x \sqrt {1+x^2}}{4 \left (2+x^2\right )}+\frac {3 \tanh ^{-1}\left (\frac {x}{\sqrt {2} \sqrt {1+x^2}}\right )}{4 \sqrt {2}} \]

[Out]

3/8*arctanh(1/2*x*2^(1/2)/(x^2+1)^(1/2))*2^(1/2)-1/4*x*(x^2+1)^(1/2)/(x^2+2)

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Rubi [A]
time = 0.01, antiderivative size = 48, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, integrand size = 17, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.176, Rules used = {390, 385, 212} \begin {gather*} \frac {3 \tanh ^{-1}\left (\frac {x}{\sqrt {2} \sqrt {x^2+1}}\right )}{4 \sqrt {2}}-\frac {x \sqrt {x^2+1}}{4 \left (x^2+2\right )} \end {gather*}

Antiderivative was successfully verified.

[In]

Int[1/(Sqrt[1 + x^2]*(2 + x^2)^2),x]

[Out]

-1/4*(x*Sqrt[1 + x^2])/(2 + x^2) + (3*ArcTanh[x/(Sqrt[2]*Sqrt[1 + x^2])])/(4*Sqrt[2])

Rule 212

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(1/(Rt[a, 2]*Rt[-b, 2]))*ArcTanh[Rt[-b, 2]*(x/Rt[a, 2])], x]
/; FreeQ[{a, b}, x] && NegQ[a/b] && (GtQ[a, 0] || LtQ[b, 0])

Rule 385

Int[((a_) + (b_.)*(x_)^(n_))^(p_)/((c_) + (d_.)*(x_)^(n_)), x_Symbol] :> Subst[Int[1/(c - (b*c - a*d)*x^n), x]
, x, x/(a + b*x^n)^(1/n)] /; FreeQ[{a, b, c, d}, x] && NeQ[b*c - a*d, 0] && EqQ[n*p + 1, 0] && IntegerQ[n]

Rule 390

Int[((a_) + (b_.)*(x_)^(n_))^(p_)*((c_) + (d_.)*(x_)^(n_))^(q_), x_Symbol] :> Simp[(-b)*x*(a + b*x^n)^(p + 1)*
((c + d*x^n)^(q + 1)/(a*n*(p + 1)*(b*c - a*d))), x] + Dist[(b*c + n*(p + 1)*(b*c - a*d))/(a*n*(p + 1)*(b*c - a
*d)), Int[(a + b*x^n)^(p + 1)*(c + d*x^n)^q, x], x] /; FreeQ[{a, b, c, d, n, q}, x] && NeQ[b*c - a*d, 0] && Eq
Q[n*(p + q + 2) + 1, 0] && (LtQ[p, -1] ||  !LtQ[q, -1]) && NeQ[p, -1]

Rubi steps

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

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Mathematica [A]
time = 0.10, size = 55, normalized size = 1.15 \begin {gather*} \frac {1}{8} \left (-\frac {2 x \sqrt {1+x^2}}{2+x^2}+3 \sqrt {2} \tanh ^{-1}\left (\frac {2+x^2-x \sqrt {1+x^2}}{\sqrt {2}}\right )\right ) \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[1/(Sqrt[1 + x^2]*(2 + x^2)^2),x]

[Out]

((-2*x*Sqrt[1 + x^2])/(2 + x^2) + 3*Sqrt[2]*ArcTanh[(2 + x^2 - x*Sqrt[1 + x^2])/Sqrt[2]])/8

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Maple [A]
time = 0.11, size = 46, normalized size = 0.96

method	result	size
risch	\(\frac {3 \arctanh \left (\frac {x \sqrt {2}}{2 \sqrt {x^{2}+1}}\right ) \sqrt {2}}{8}-\frac {x \sqrt {x^{2}+1}}{4 \left (x^{2}+2\right )}\)	\(38\)
default	\(\frac {x}{4 \sqrt {x^{2}+1}\, \left (\frac {x^{2}}{x^{2}+1}-2\right )}+\frac {3 \arctanh \left (\frac {x \sqrt {2}}{2 \sqrt {x^{2}+1}}\right ) \sqrt {2}}{8}\)	\(46\)
trager	\(-\frac {x \sqrt {x^{2}+1}}{4 \left (x^{2}+2\right )}+\frac {3 \RootOf \left (\textit {\_Z}^{2}-2\right ) \ln \left (\frac {3 \RootOf \left (\textit {\_Z}^{2}-2\right ) x^{2}+4 x \sqrt {x^{2}+1}+2 \RootOf \left (\textit {\_Z}^{2}-2\right )}{x^{2}+2}\right )}{16}\)	\(66\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(x^2+2)^2/(x^2+1)^(1/2),x,method=_RETURNVERBOSE)

[Out]

1/4*x/(x^2+1)^(1/2)/(x^2/(x^2+1)-2)+3/8*arctanh(1/2*x*2^(1/2)/(x^2+1)^(1/2))*2^(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/(x^2+2)^2/(x^2+1)^(1/2),x, algorithm="maxima")

[Out]

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

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Fricas [B] Leaf count of result is larger than twice the leaf count of optimal. 83 vs. \(2 (37) = 74\).
time = 0.48, size = 83, normalized size = 1.73 \begin {gather*} \frac {3 \, \sqrt {2} {\left (x^{2} + 2\right )} \log \left (\frac {9 \, x^{2} + 2 \, \sqrt {2} {\left (3 \, x^{2} + 2\right )} + 2 \, \sqrt {x^{2} + 1} {\left (3 \, \sqrt {2} x + 4 \, x\right )} + 6}{x^{2} + 2}\right ) - 4 \, x^{2} - 4 \, \sqrt {x^{2} + 1} x - 8}{16 \, {\left (x^{2} + 2\right )}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(x^2+2)^2/(x^2+1)^(1/2),x, algorithm="fricas")

[Out]

1/16*(3*sqrt(2)*(x^2 + 2)*log((9*x^2 + 2*sqrt(2)*(3*x^2 + 2) + 2*sqrt(x^2 + 1)*(3*sqrt(2)*x + 4*x) + 6)/(x^2 +
2)) - 4*x^2 - 4*sqrt(x^2 + 1)*x - 8)/(x^2 + 2)

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Sympy [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \int \frac {1}{\sqrt {x^{2} + 1} \left (x^{2} + 2\right )^{2}}\, dx \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(x**2+2)**2/(x**2+1)**(1/2),x)

[Out]

Integral(1/(sqrt(x**2 + 1)*(x**2 + 2)**2), x)

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Giac [B] Leaf count of result is larger than twice the leaf count of optimal. 101 vs. \(2 (37) = 74\).
time = 0.56, size = 101, normalized size = 2.10 \begin {gather*} -\frac {3}{16} \, \sqrt {2} \log \left (\frac {{\left (x - \sqrt {x^{2} + 1}\right )}^{2} - 2 \, \sqrt {2} + 3}{{\left (x - \sqrt {x^{2} + 1}\right )}^{2} + 2 \, \sqrt {2} + 3}\right ) - \frac {3 \, {\left (x - \sqrt {x^{2} + 1}\right )}^{2} + 1}{2 \, {\left ({\left (x - \sqrt {x^{2} + 1}\right )}^{4} + 6 \, {\left (x - \sqrt {x^{2} + 1}\right )}^{2} + 1\right )}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(x^2+2)^2/(x^2+1)^(1/2),x, algorithm="giac")

[Out]

-3/16*sqrt(2)*log(((x - sqrt(x^2 + 1))^2 - 2*sqrt(2) + 3)/((x - sqrt(x^2 + 1))^2 + 2*sqrt(2) + 3)) - 1/2*(3*(x
- sqrt(x^2 + 1))^2 + 1)/((x - sqrt(x^2 + 1))^4 + 6*(x - sqrt(x^2 + 1))^2 + 1)

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Mupad [B]
time = 0.09, size = 117, normalized size = 2.44 \begin {gather*} -\frac {3\,\sqrt {2}\,\left (\ln \left (x-\sqrt {2}\,1{}\mathrm {i}\right )-\ln \left (1+\sqrt {2}\,x\,1{}\mathrm {i}+\sqrt {x^2+1}\,1{}\mathrm {i}\right )\right )}{16}+\frac {3\,\sqrt {2}\,\left (\ln \left (x+\sqrt {2}\,1{}\mathrm {i}\right )-\ln \left (1-\sqrt {2}\,x\,1{}\mathrm {i}+\sqrt {x^2+1}\,1{}\mathrm {i}\right )\right )}{16}-\frac {\sqrt {x^2+1}}{8\,\left (x-\sqrt {2}\,1{}\mathrm {i}\right )}-\frac {\sqrt {x^2+1}}{8\,\left (x+\sqrt {2}\,1{}\mathrm {i}\right )} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/((x^2 + 1)^(1/2)*(x^2 + 2)^2),x)

[Out]

(3*2^(1/2)*(log(x + 2^(1/2)*1i) - log((x^2 + 1)^(1/2)*1i - 2^(1/2)*x*1i + 1)))/16 - (3*2^(1/2)*(log(x - 2^(1/2
)*1i) - log(2^(1/2)*x*1i + (x^2 + 1)^(1/2)*1i + 1)))/16 - (x^2 + 1)^(1/2)/(8*(x - 2^(1/2)*1i)) - (x^2 + 1)^(1/
2)/(8*(x + 2^(1/2)*1i))

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