\(\int \frac {1+x^2}{(-1-x+x^2) \sqrt [3]{-1+x^6}} \, dx\) [2493]

Optimal result

Integrand size = 25, antiderivative size = 206 \[ \int \frac {1+x^2}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}} \, dx=\frac {\arctan \left (\frac {\sqrt {3} \sqrt [3]{-1+x^6}}{-2^{2/3}+2^{2/3} x+2^{2/3} x^2+\sqrt [3]{-1+x^6}}\right )}{2^{2/3} \sqrt {3}}+\frac {\log \left (-2^{2/3}+2^{2/3} x+2^{2/3} x^2-2 \sqrt [3]{-1+x^6}\right )}{3\ 2^{2/3}}-\frac {\log \left (\sqrt [3]{2}-2 \sqrt [3]{2} x-\sqrt [3]{2} x^2+2 \sqrt [3]{2} x^3+\sqrt [3]{2} x^4+\left (-2^{2/3}+2^{2/3} x+2^{2/3} x^2\right ) \sqrt [3]{-1+x^6}+2 \left (-1+x^6\right )^{2/3}\right )}{6\ 2^{2/3}} \]

[Out]

1/6*arctan(3^(1/2)*(x^6-1)^(1/3)/(-2^(2/3)+2^(2/3)*x+2^(2/3)*x^2+(x^6-1)^(1/3)))*2^(1/3)*3^(1/2)+1/6*ln(-2^(2/
3)+2^(2/3)*x+2^(2/3)*x^2-2*(x^6-1)^(1/3))*2^(1/3)-1/12*ln(2^(1/3)-2*2^(1/3)*x-2^(1/3)*x^2+2*2^(1/3)*x^3+2^(1/3
)*x^4+(-2^(2/3)+2^(2/3)*x+2^(2/3)*x^2)*(x^6-1)^(1/3)+2*(x^6-1)^(2/3))*2^(1/3)

Rubi [F]

\[ \int \frac {1+x^2}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}} \, dx=\int \frac {1+x^2}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}} \, dx \]

[In]

Int[(1 + x^2)/((-1 - x + x^2)*(-1 + x^6)^(1/3)),x]

[Out]

(x*(1 - x^6)^(1/3)*Hypergeometric2F1[1/6, 1/3, 7/6, x^6])/(-1 + x^6)^(1/3) + (1 + Sqrt[5])*Defer[Int][1/((-1 -
Sqrt[5] + 2*x)*(-1 + x^6)^(1/3)), x] + (1 - Sqrt[5])*Defer[Int][1/((-1 + Sqrt[5] + 2*x)*(-1 + x^6)^(1/3)), x]

Rubi steps \begin{align*} \text {integral}& = \int \left (\frac {1}{\sqrt [3]{-1+x^6}}+\frac {2+x}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}}\right ) \, dx \\ & = \int \frac {1}{\sqrt [3]{-1+x^6}} \, dx+\int \frac {2+x}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}} \, dx \\ & = \frac {\sqrt [3]{1-x^6} \int \frac {1}{\sqrt [3]{1-x^6}} \, dx}{\sqrt [3]{-1+x^6}}+\int \left (\frac {1+\sqrt {5}}{\left (-1-\sqrt {5}+2 x\right ) \sqrt [3]{-1+x^6}}+\frac {1-\sqrt {5}}{\left (-1+\sqrt {5}+2 x\right ) \sqrt [3]{-1+x^6}}\right ) \, dx \\ & = \frac {x \sqrt [3]{1-x^6} \operatorname {Hypergeometric2F1}\left (\frac {1}{6},\frac {1}{3},\frac {7}{6},x^6\right )}{\sqrt [3]{-1+x^6}}+\left (1-\sqrt {5}\right ) \int \frac {1}{\left (-1+\sqrt {5}+2 x\right ) \sqrt [3]{-1+x^6}} \, dx+\left (1+\sqrt {5}\right ) \int \frac {1}{\left (-1-\sqrt {5}+2 x\right ) \sqrt [3]{-1+x^6}} \, dx \\ \end{align*}

Mathematica [A] (verified)

Time = 0.00 (sec) , antiderivative size = 184, normalized size of antiderivative = 0.89 \[ \int \frac {1+x^2}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}} \, dx=\frac {2 \sqrt {3} \arctan \left (\frac {\sqrt {3} \sqrt [3]{-1+x^6}}{-2^{2/3}+2^{2/3} x+2^{2/3} x^2+\sqrt [3]{-1+x^6}}\right )+2 \log \left (-2^{2/3}+2^{2/3} x+2^{2/3} x^2-2 \sqrt [3]{-1+x^6}\right )-\log \left (\sqrt [3]{2}-2 \sqrt [3]{2} x-\sqrt [3]{2} x^2+2 \sqrt [3]{2} x^3+\sqrt [3]{2} x^4+2^{2/3} \left (-1+x+x^2\right ) \sqrt [3]{-1+x^6}+2 \left (-1+x^6\right )^{2/3}\right )}{6\ 2^{2/3}} \]

[In]

Integrate[(1 + x^2)/((-1 - x + x^2)*(-1 + x^6)^(1/3)),x]

[Out]

(2*Sqrt[3]*ArcTan[(Sqrt[3]*(-1 + x^6)^(1/3))/(-2^(2/3) + 2^(2/3)*x + 2^(2/3)*x^2 + (-1 + x^6)^(1/3))] + 2*Log[
-2^(2/3) + 2^(2/3)*x + 2^(2/3)*x^2 - 2*(-1 + x^6)^(1/3)] - Log[2^(1/3) - 2*2^(1/3)*x - 2^(1/3)*x^2 + 2*2^(1/3)
*x^3 + 2^(1/3)*x^4 + 2^(2/3)*(-1 + x + x^2)*(-1 + x^6)^(1/3) + 2*(-1 + x^6)^(2/3)])/(6*2^(2/3))

Maple [C] (verified)

Result contains higher order function than in optimal. Order 9 vs. order 3.

Time = 0.00 (sec) , antiderivative size = 2717, normalized size of antiderivative = 13.19

method	result	size
trager	\(\text {Expression too large to display}\)	\(2717\)

[In]

int((x^2+1)/(x^2-x-1)/(x^6-1)^(1/3),x,method=_RETURNVERBOSE)

[Out]

-1/6*ln((-10*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^3*x^3-100*RootOf(RootOf(_Z^3-2
)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)^2*RootOf(_Z^3-2)^2*x^3+60*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)^
2*RootOf(_Z^3-2)^2*x+6*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^3*x-9*RootOf(_Z^3-2)
^2*(x^6-1)^(1/3)-18*x^2*(x^6-1)^(2/3)+50*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*x^3+5*RootOf(_Z^3
-2)*x^3-7*RootOf(_Z^3-2)*x^6-3*RootOf(_Z^3-2)*x^5-3*RootOf(_Z^3-2)*x-70*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z
^3-2)+4*_Z^2)*x^6-30*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*x^5-30*RootOf(RootOf(_Z^3-2)^2+2*_Z*R
ootOf(_Z^3-2)+4*_Z^2)*x-48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^2*(x^6-1)^(2/3)*
x^2-18*x*(x^6-1)^(2/3)-48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)*(x^6-1)^(1/3)*x^4
-48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^2*(x^6-1)^(2/3)*x-96*RootOf(RootOf(_Z^3
-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)*(x^6-1)^(1/3)*x^3+48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3
-2)+4*_Z^2)*RootOf(_Z^3-2)*(x^6-1)^(1/3)*x^2+96*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^
3-2)*(x^6-1)^(1/3)*x+18*(x^6-1)^(2/3)+60*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)^2*RootOf(_Z^3-2)^
2*x^5+6*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^3*x^5+70*RootOf(RootOf(_Z^3-2)^2+2*
_Z*RootOf(_Z^3-2)+4*_Z^2)+7*RootOf(_Z^3-2)-9*RootOf(_Z^3-2)^2*(x^6-1)^(1/3)*x^4-18*RootOf(_Z^3-2)^2*(x^6-1)^(1
/3)*x^3+48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^2*(x^6-1)^(2/3)+9*RootOf(_Z^3-2)
^2*(x^6-1)^(1/3)*x^2+18*RootOf(_Z^3-2)^2*(x^6-1)^(1/3)*x-48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2
)*RootOf(_Z^3-2)*(x^6-1)^(1/3))/(x^2-x-1)^3)*RootOf(_Z^3-2)-1/3*ln((-10*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z
^3-2)+4*_Z^2)*RootOf(_Z^3-2)^3*x^3-100*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)^2*RootOf(_Z^3-2)^2*
x^3+60*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)^2*RootOf(_Z^3-2)^2*x+6*RootOf(RootOf(_Z^3-2)^2+2*_Z
*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^3*x-9*RootOf(_Z^3-2)^2*(x^6-1)^(1/3)-18*x^2*(x^6-1)^(2/3)+50*RootOf(Roo
tOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*x^3+5*RootOf(_Z^3-2)*x^3-7*RootOf(_Z^3-2)*x^6-3*RootOf(_Z^3-2)*x^5-3
*RootOf(_Z^3-2)*x-70*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*x^6-30*RootOf(RootOf(_Z^3-2)^2+2*_Z*R
ootOf(_Z^3-2)+4*_Z^2)*x^5-30*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*x-48*RootOf(RootOf(_Z^3-2)^2+
2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^2*(x^6-1)^(2/3)*x^2-18*x*(x^6-1)^(2/3)-48*RootOf(RootOf(_Z^3-2)^2+2
*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)*(x^6-1)^(1/3)*x^4-48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_
Z^2)*RootOf(_Z^3-2)^2*(x^6-1)^(2/3)*x-96*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)*(x
^6-1)^(1/3)*x^3+48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)*(x^6-1)^(1/3)*x^2+96*Roo
tOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)*(x^6-1)^(1/3)*x+18*(x^6-1)^(2/3)+60*RootOf(Roo
tOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)^2*RootOf(_Z^3-2)^2*x^5+6*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)
+4*_Z^2)*RootOf(_Z^3-2)^3*x^5+70*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)+7*RootOf(_Z^3-2)-9*RootOf
(_Z^3-2)^2*(x^6-1)^(1/3)*x^4-18*RootOf(_Z^3-2)^2*(x^6-1)^(1/3)*x^3+48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3
-2)+4*_Z^2)*RootOf(_Z^3-2)^2*(x^6-1)^(2/3)+9*RootOf(_Z^3-2)^2*(x^6-1)^(1/3)*x^2+18*RootOf(_Z^3-2)^2*(x^6-1)^(1
/3)*x-48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)*(x^6-1)^(1/3))/(x^2-x-1)^3)*RootOf
(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)+1/3*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*ln((-40*
RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^3*x^3-100*RootOf(RootOf(_Z^3-2)^2+2*_Z*Root
Of(_Z^3-2)+4*_Z^2)^2*RootOf(_Z^3-2)^2*x^3+60*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)^2*RootOf(_Z^3
-2)^2*x+24*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^3*x+15*RootOf(_Z^3-2)^2*(x^6-1)^
(1/3)+30*x^2*(x^6-1)^(2/3)-150*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*x^3-60*RootOf(_Z^3-2)*x^3+2
8*RootOf(_Z^3-2)*x^6+36*RootOf(_Z^3-2)*x^5+36*RootOf(_Z^3-2)*x+70*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+
4*_Z^2)*x^6+90*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*x^5+90*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(
_Z^3-2)+4*_Z^2)*x+48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^2*(x^6-1)^(2/3)*x^2+30
*x*(x^6-1)^(2/3)+48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)*(x^6-1)^(1/3)*x^4+48*Ro
otOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^2*(x^6-1)^(2/3)*x+96*RootOf(RootOf(_Z^3-2)^2+
2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)*(x^6-1)^(1/3)*x^3-48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*
_Z^2)*RootOf(_Z^3-2)*(x^6-1)^(1/3)*x^2-96*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)*(
x^6-1)^(1/3)*x-30*(x^6-1)^(2/3)+60*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)^2*RootOf(_Z^3-2)^2*x^5+
24*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^3*x^5-70*RootOf(RootOf(_Z^3-2)^2+2*_Z*Ro
otOf(_Z^3-2)+4*_Z^2)-28*RootOf(_Z^3-2)+15*RootOf(_Z^3-2)^2*(x^6-1)^(1/3)*x^4+30*RootOf(_Z^3-2)^2*(x^6-1)^(1/3)
*x^3-48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*RootOf(_Z^3-2)^2*(x^6-1)^(2/3)-15*RootOf(_Z^3-2)^2
*(x^6-1)^(1/3)*x^2-30*RootOf(_Z^3-2)^2*(x^6-1)^(1/3)*x+48*RootOf(RootOf(_Z^3-2)^2+2*_Z*RootOf(_Z^3-2)+4*_Z^2)*
RootOf(_Z^3-2)*(x^6-1)^(1/3))/(x^2-x-1)^3)

Fricas [A] (verification not implemented)

none

Time = 12.28 (sec) , antiderivative size = 223, normalized size of antiderivative = 1.08 \[ \int \frac {1+x^2}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}} \, dx=-\frac {1}{6} \cdot 4^{\frac {1}{6}} \sqrt {3} \arctan \left (\frac {4^{\frac {1}{6}} \sqrt {3} {\left (2 \cdot 4^{\frac {2}{3}} {\left (x^{6} - 1\right )}^{\frac {2}{3}} {\left (x^{2} + x - 1\right )} - 4^{\frac {1}{3}} {\left (x^{6} - 3 \, x^{5} + 5 \, x^{3} - 3 \, x - 1\right )} - 4 \, {\left (x^{6} - 1\right )}^{\frac {1}{3}} {\left (x^{4} + 2 \, x^{3} - x^{2} - 2 \, x + 1\right )}\right )}}{6 \, {\left (3 \, x^{6} + 3 \, x^{5} - 5 \, x^{3} + 3 \, x - 3\right )}}\right ) - \frac {1}{24} \cdot 4^{\frac {2}{3}} \log \left (\frac {4^{\frac {2}{3}} {\left (x^{6} - 1\right )}^{\frac {2}{3}} + 4^{\frac {1}{3}} {\left (x^{4} + 2 \, x^{3} - x^{2} - 2 \, x + 1\right )} + 2 \, {\left (x^{6} - 1\right )}^{\frac {1}{3}} {\left (x^{2} + x - 1\right )}}{x^{4} - 2 \, x^{3} - x^{2} + 2 \, x + 1}\right ) + \frac {1}{12} \cdot 4^{\frac {2}{3}} \log \left (-\frac {4^{\frac {1}{3}} {\left (x^{2} + x - 1\right )} - 2 \, {\left (x^{6} - 1\right )}^{\frac {1}{3}}}{x^{2} - x - 1}\right ) \]

[In]

integrate((x^2+1)/(x^2-x-1)/(x^6-1)^(1/3),x, algorithm="fricas")

[Out]

-1/6*4^(1/6)*sqrt(3)*arctan(1/6*4^(1/6)*sqrt(3)*(2*4^(2/3)*(x^6 - 1)^(2/3)*(x^2 + x - 1) - 4^(1/3)*(x^6 - 3*x^
5 + 5*x^3 - 3*x - 1) - 4*(x^6 - 1)^(1/3)*(x^4 + 2*x^3 - x^2 - 2*x + 1))/(3*x^6 + 3*x^5 - 5*x^3 + 3*x - 3)) - 1
/24*4^(2/3)*log((4^(2/3)*(x^6 - 1)^(2/3) + 4^(1/3)*(x^4 + 2*x^3 - x^2 - 2*x + 1) + 2*(x^6 - 1)^(1/3)*(x^2 + x
- 1))/(x^4 - 2*x^3 - x^2 + 2*x + 1)) + 1/12*4^(2/3)*log(-(4^(1/3)*(x^2 + x - 1) - 2*(x^6 - 1)^(1/3))/(x^2 - x
- 1))

Sympy [F]

\[ \int \frac {1+x^2}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}} \, dx=\int \frac {x^{2} + 1}{\sqrt [3]{\left (x - 1\right ) \left (x + 1\right ) \left (x^{2} - x + 1\right ) \left (x^{2} + x + 1\right )} \left (x^{2} - x - 1\right )}\, dx \]

[In]

integrate((x**2+1)/(x**2-x-1)/(x**6-1)**(1/3),x)

[Out]

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

Maxima [F]

\[ \int \frac {1+x^2}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}} \, dx=\int { \frac {x^{2} + 1}{{\left (x^{6} - 1\right )}^{\frac {1}{3}} {\left (x^{2} - x - 1\right )}} \,d x } \]

[In]

integrate((x^2+1)/(x^2-x-1)/(x^6-1)^(1/3),x, algorithm="maxima")

[Out]

integrate((x^2 + 1)/((x^6 - 1)^(1/3)*(x^2 - x - 1)), x)

Giac [F]

\[ \int \frac {1+x^2}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}} \, dx=\int { \frac {x^{2} + 1}{{\left (x^{6} - 1\right )}^{\frac {1}{3}} {\left (x^{2} - x - 1\right )}} \,d x } \]

[In]

integrate((x^2+1)/(x^2-x-1)/(x^6-1)^(1/3),x, algorithm="giac")

[Out]

integrate((x^2 + 1)/((x^6 - 1)^(1/3)*(x^2 - x - 1)), x)

Mupad [F(-1)]

Timed out. \[ \int \frac {1+x^2}{\left (-1-x+x^2\right ) \sqrt [3]{-1+x^6}} \, dx=\int -\frac {x^2+1}{{\left (x^6-1\right )}^{1/3}\,\left (-x^2+x+1\right )} \,d x \]

[In]

int(-(x^2 + 1)/((x^6 - 1)^(1/3)*(x - x^2 + 1)),x)

[Out]

int(-(x^2 + 1)/((x^6 - 1)^(1/3)*(x - x^2 + 1)), x)