\(\int \frac {1}{x \sqrt [4]{1+x^3}} \, dx\) [346]

Optimal result

Integrand size = 13, antiderivative size = 29 \[ \int \frac {1}{x \sqrt [4]{1+x^3}} \, dx=\frac {2}{3} \arctan \left (\sqrt [4]{1+x^3}\right )-\frac {2}{3} \text {arctanh}\left (\sqrt [4]{1+x^3}\right ) \]

[Out]

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

Rubi [A] (verified)

Time = 0.01 (sec) , antiderivative size = 29, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 5, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.385, Rules used = {272, 65, 304, 209, 212} \[ \int \frac {1}{x \sqrt [4]{1+x^3}} \, dx=\frac {2}{3} \arctan \left (\sqrt [4]{x^3+1}\right )-\frac {2}{3} \text {arctanh}\left (\sqrt [4]{x^3+1}\right ) \]

[In]

Int[1/(x*(1 + x^3)^(1/4)),x]

[Out]

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

Rule 65

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> With[{p = Denominator[m]}, Dist[p/b, Sub
st[Int[x^(p*(m + 1) - 1)*(c - a*(d/b) + d*(x^p/b))^n, x], x, (a + b*x)^(1/p)], x]] /; FreeQ[{a, b, c, d}, x] &
& NeQ[b*c - a*d, 0] && LtQ[-1, m, 0] && LeQ[-1, n, 0] && LeQ[Denominator[n], Denominator[m]] && IntLinearQ[a,
b, c, d, m, n, x]

Rule 209

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

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 272

Int[(x_)^(m_.)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Dist[1/n, Subst[Int[x^(Simplify[(m + 1)/n] - 1)*(a
+ b*x)^p, x], x, x^n], x] /; FreeQ[{a, b, m, n, p}, x] && IntegerQ[Simplify[(m + 1)/n]]

Rule 304

Int[(x_)^2/((a_) + (b_.)*(x_)^4), x_Symbol] :> With[{r = Numerator[Rt[-a/b, 2]], s = Denominator[Rt[-a/b, 2]]}
, Dist[s/(2*b), Int[1/(r + s*x^2), x], x] - Dist[s/(2*b), Int[1/(r - s*x^2), x], x]] /; FreeQ[{a, b}, x] &&  !
GtQ[a/b, 0]

Rubi steps \begin{align*} \text {integral}& = \frac {1}{3} \text {Subst}\left (\int \frac {1}{x \sqrt [4]{1+x}} \, dx,x,x^3\right ) \\ & = \frac {4}{3} \text {Subst}\left (\int \frac {x^2}{-1+x^4} \, dx,x,\sqrt [4]{1+x^3}\right ) \\ & = -\left (\frac {2}{3} \text {Subst}\left (\int \frac {1}{1-x^2} \, dx,x,\sqrt [4]{1+x^3}\right )\right )+\frac {2}{3} \text {Subst}\left (\int \frac {1}{1+x^2} \, dx,x,\sqrt [4]{1+x^3}\right ) \\ & = \frac {2}{3} \arctan \left (\sqrt [4]{1+x^3}\right )-\frac {2}{3} \text {arctanh}\left (\sqrt [4]{1+x^3}\right ) \\ \end{align*}

Mathematica [A] (verified)

Time = 0.02 (sec) , antiderivative size = 29, normalized size of antiderivative = 1.00 \[ \int \frac {1}{x \sqrt [4]{1+x^3}} \, dx=\frac {2}{3} \arctan \left (\sqrt [4]{1+x^3}\right )-\frac {2}{3} \text {arctanh}\left (\sqrt [4]{1+x^3}\right ) \]

[In]

Integrate[1/(x*(1 + x^3)^(1/4)),x]

[Out]

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

Maple [A] (verified)

Time = 1.86 (sec) , antiderivative size = 36, normalized size of antiderivative = 1.24

method	result	size
pseudoelliptic	\(\frac {\ln \left (\left (x^{3}+1\right )^{\frac {1}{4}}-1\right )}{3}-\frac {\ln \left (\left (x^{3}+1\right )^{\frac {1}{4}}+1\right )}{3}+\frac {2 \arctan \left (\left (x^{3}+1\right )^{\frac {1}{4}}\right )}{3}\)	\(36\)
meijerg	\(\frac {\sqrt {2}\, \Gamma \left (\frac {3}{4}\right ) \left (-\frac {\pi \sqrt {2}\, x^{3} \operatorname {hypergeom}\left (\left [1, 1, \frac {5}{4}\right ], \left [2, 2\right ], -x^{3}\right )}{4 \Gamma \left (\frac {3}{4}\right )}+\frac {\left (-3 \ln \left (2\right )-\frac {\pi }{2}+3 \ln \left (x \right )\right ) \pi \sqrt {2}}{\Gamma \left (\frac {3}{4}\right )}\right )}{6 \pi }\)	\(59\)
trager	\(-\frac {\ln \left (\frac {2 \left (x^{3}+1\right )^{\frac {3}{4}}+x^{3}+2 \sqrt {x^{3}+1}+2 \left (x^{3}+1\right )^{\frac {1}{4}}+2}{x^{3}}\right )}{3}+\frac {\operatorname {RootOf}\left (\textit {\_Z}^{2}+1\right ) \ln \left (\frac {-\operatorname {RootOf}\left (\textit {\_Z}^{2}+1\right ) x^{3}+2 \left (x^{3}+1\right )^{\frac {3}{4}}+2 \operatorname {RootOf}\left (\textit {\_Z}^{2}+1\right ) \sqrt {x^{3}+1}-2 \left (x^{3}+1\right )^{\frac {1}{4}}-2 \operatorname {RootOf}\left (\textit {\_Z}^{2}+1\right )}{x^{3}}\right )}{3}\)	\(107\)

[In]

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

[Out]

1/3*ln((x^3+1)^(1/4)-1)-1/3*ln((x^3+1)^(1/4)+1)+2/3*arctan((x^3+1)^(1/4))

Fricas [A] (verification not implemented)

none

Time = 0.25 (sec) , antiderivative size = 35, normalized size of antiderivative = 1.21 \[ \int \frac {1}{x \sqrt [4]{1+x^3}} \, dx=\frac {2}{3} \, \arctan \left ({\left (x^{3} + 1\right )}^{\frac {1}{4}}\right ) - \frac {1}{3} \, \log \left ({\left (x^{3} + 1\right )}^{\frac {1}{4}} + 1\right ) + \frac {1}{3} \, \log \left ({\left (x^{3} + 1\right )}^{\frac {1}{4}} - 1\right ) \]

[In]

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

[Out]

2/3*arctan((x^3 + 1)^(1/4)) - 1/3*log((x^3 + 1)^(1/4) + 1) + 1/3*log((x^3 + 1)^(1/4) - 1)

Sympy [C] (verification not implemented)

Result contains complex when optimal does not.

Time = 0.42 (sec) , antiderivative size = 32, normalized size of antiderivative = 1.10 \[ \int \frac {1}{x \sqrt [4]{1+x^3}} \, dx=- \frac {\Gamma \left (\frac {1}{4}\right ) {{}_{2}F_{1}\left (\begin {matrix} \frac {1}{4}, \frac {1}{4} \\ \frac {5}{4} \end {matrix}\middle | {\frac {e^{i \pi }}{x^{3}}} \right )}}{3 x^{\frac {3}{4}} \Gamma \left (\frac {5}{4}\right )} \]

[In]

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

[Out]

-gamma(1/4)*hyper((1/4, 1/4), (5/4,), exp_polar(I*pi)/x**3)/(3*x**(3/4)*gamma(5/4))

Maxima [A] (verification not implemented)

none

Time = 0.26 (sec) , antiderivative size = 35, normalized size of antiderivative = 1.21 \[ \int \frac {1}{x \sqrt [4]{1+x^3}} \, dx=\frac {2}{3} \, \arctan \left ({\left (x^{3} + 1\right )}^{\frac {1}{4}}\right ) - \frac {1}{3} \, \log \left ({\left (x^{3} + 1\right )}^{\frac {1}{4}} + 1\right ) + \frac {1}{3} \, \log \left ({\left (x^{3} + 1\right )}^{\frac {1}{4}} - 1\right ) \]

[In]

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

[Out]

2/3*arctan((x^3 + 1)^(1/4)) - 1/3*log((x^3 + 1)^(1/4) + 1) + 1/3*log((x^3 + 1)^(1/4) - 1)

Giac [A] (verification not implemented)

none

Time = 0.26 (sec) , antiderivative size = 36, normalized size of antiderivative = 1.24 \[ \int \frac {1}{x \sqrt [4]{1+x^3}} \, dx=\frac {2}{3} \, \arctan \left ({\left (x^{3} + 1\right )}^{\frac {1}{4}}\right ) - \frac {1}{3} \, \log \left ({\left (x^{3} + 1\right )}^{\frac {1}{4}} + 1\right ) + \frac {1}{3} \, \log \left ({\left | {\left (x^{3} + 1\right )}^{\frac {1}{4}} - 1 \right |}\right ) \]

[In]

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

[Out]

2/3*arctan((x^3 + 1)^(1/4)) - 1/3*log((x^3 + 1)^(1/4) + 1) + 1/3*log(abs((x^3 + 1)^(1/4) - 1))

Mupad [B] (verification not implemented)

Time = 5.05 (sec) , antiderivative size = 21, normalized size of antiderivative = 0.72 \[ \int \frac {1}{x \sqrt [4]{1+x^3}} \, dx=\frac {2\,\mathrm {atan}\left ({\left (x^3+1\right )}^{1/4}\right )}{3}-\frac {2\,\mathrm {atanh}\left ({\left (x^3+1\right )}^{1/4}\right )}{3} \]

[In]

int(1/(x*(x^3 + 1)^(1/4)),x)

[Out]

(2*atan((x^3 + 1)^(1/4)))/3 - (2*atanh((x^3 + 1)^(1/4)))/3