Integrand size = 15, antiderivative size = 105 \[ \int \frac {x^8}{\left (a+b x^4\right )^{3/4}} \, dx=-\frac {5 a x \sqrt [4]{a+b x^4}}{12 b^2}+\frac {x^5 \sqrt [4]{a+b x^4}}{6 b}-\frac {5 a^{3/2} \left (1+\frac {a}{b x^4}\right )^{3/4} x^3 \operatorname {EllipticF}\left (\frac {1}{2} \cot ^{-1}\left (\frac {\sqrt {b} x^2}{\sqrt {a}}\right ),2\right )}{12 b^{3/2} \left (a+b x^4\right )^{3/4}} \] Output:
-5/12*a*x*(b*x^4+a)^(1/4)/b^2+1/6*x^5*(b*x^4+a)^(1/4)/b-5/12*a^(3/2)*(1+a/ b/x^4)^(3/4)*x^3*InverseJacobiAM(1/2*arccot(b^(1/2)*x^2/a^(1/2)),2^(1/2))/ b^(3/2)/(b*x^4+a)^(3/4)
Result contains higher order function than in optimal. Order 5 vs. order 4 in optimal.
Time = 6.67 (sec) , antiderivative size = 79, normalized size of antiderivative = 0.75 \[ \int \frac {x^8}{\left (a+b x^4\right )^{3/4}} \, dx=\frac {-5 a^2 x-3 a b x^5+2 b^2 x^9+5 a^2 x \left (1+\frac {b x^4}{a}\right )^{3/4} \operatorname {Hypergeometric2F1}\left (\frac {1}{4},\frac {3}{4},\frac {5}{4},-\frac {b x^4}{a}\right )}{12 b^2 \left (a+b x^4\right )^{3/4}} \] Input:
Integrate[x^8/(a + b*x^4)^(3/4),x]
Output:
(-5*a^2*x - 3*a*b*x^5 + 2*b^2*x^9 + 5*a^2*x*(1 + (b*x^4)/a)^(3/4)*Hypergeo metric2F1[1/4, 3/4, 5/4, -((b*x^4)/a)])/(12*b^2*(a + b*x^4)^(3/4))
Time = 0.44 (sec) , antiderivative size = 113, normalized size of antiderivative = 1.08, number of steps used = 7, number of rules used = 6, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.400, Rules used = {843, 843, 768, 858, 807, 229}
Below are the steps used by Rubi to obtain the solution. The rule number used for the transformation is given above next to the arrow. The rules definitions used are listed below.
\(\displaystyle \int \frac {x^8}{\left (a+b x^4\right )^{3/4}} \, dx\) |
\(\Big \downarrow \) 843 |
\(\displaystyle \frac {x^5 \sqrt [4]{a+b x^4}}{6 b}-\frac {5 a \int \frac {x^4}{\left (b x^4+a\right )^{3/4}}dx}{6 b}\) |
\(\Big \downarrow \) 843 |
\(\displaystyle \frac {x^5 \sqrt [4]{a+b x^4}}{6 b}-\frac {5 a \left (\frac {x \sqrt [4]{a+b x^4}}{2 b}-\frac {a \int \frac {1}{\left (b x^4+a\right )^{3/4}}dx}{2 b}\right )}{6 b}\) |
\(\Big \downarrow \) 768 |
\(\displaystyle \frac {x^5 \sqrt [4]{a+b x^4}}{6 b}-\frac {5 a \left (\frac {x \sqrt [4]{a+b x^4}}{2 b}-\frac {a x^3 \left (\frac {a}{b x^4}+1\right )^{3/4} \int \frac {1}{\left (\frac {a}{b x^4}+1\right )^{3/4} x^3}dx}{2 b \left (a+b x^4\right )^{3/4}}\right )}{6 b}\) |
\(\Big \downarrow \) 858 |
\(\displaystyle \frac {x^5 \sqrt [4]{a+b x^4}}{6 b}-\frac {5 a \left (\frac {a x^3 \left (\frac {a}{b x^4}+1\right )^{3/4} \int \frac {1}{\left (\frac {a}{b x^4}+1\right )^{3/4} x}d\frac {1}{x}}{2 b \left (a+b x^4\right )^{3/4}}+\frac {x \sqrt [4]{a+b x^4}}{2 b}\right )}{6 b}\) |
\(\Big \downarrow \) 807 |
\(\displaystyle \frac {x^5 \sqrt [4]{a+b x^4}}{6 b}-\frac {5 a \left (\frac {a x^3 \left (\frac {a}{b x^4}+1\right )^{3/4} \int \frac {1}{\left (\frac {a}{b x^2}+1\right )^{3/4}}d\frac {1}{x^2}}{4 b \left (a+b x^4\right )^{3/4}}+\frac {x \sqrt [4]{a+b x^4}}{2 b}\right )}{6 b}\) |
\(\Big \downarrow \) 229 |
\(\displaystyle \frac {x^5 \sqrt [4]{a+b x^4}}{6 b}-\frac {5 a \left (\frac {\sqrt {a} x^3 \left (\frac {a}{b x^4}+1\right )^{3/4} \operatorname {EllipticF}\left (\frac {1}{2} \arctan \left (\frac {\sqrt {a}}{\sqrt {b} x^2}\right ),2\right )}{2 \sqrt {b} \left (a+b x^4\right )^{3/4}}+\frac {x \sqrt [4]{a+b x^4}}{2 b}\right )}{6 b}\) |
Input:
Int[x^8/(a + b*x^4)^(3/4),x]
Output:
(x^5*(a + b*x^4)^(1/4))/(6*b) - (5*a*((x*(a + b*x^4)^(1/4))/(2*b) + (Sqrt[ a]*(1 + a/(b*x^4))^(3/4)*x^3*EllipticF[ArcTan[Sqrt[a]/(Sqrt[b]*x^2)]/2, 2] )/(2*Sqrt[b]*(a + b*x^4)^(3/4))))/(6*b)
Int[((a_) + (b_.)*(x_)^2)^(-3/4), x_Symbol] :> Simp[(2/(a^(3/4)*Rt[b/a, 2]) )*EllipticF[(1/2)*ArcTan[Rt[b/a, 2]*x], 2], x] /; FreeQ[{a, b}, x] && GtQ[a , 0] && PosQ[b/a]
Int[((a_) + (b_.)*(x_)^4)^(-3/4), x_Symbol] :> Simp[x^3*((1 + a/(b*x^4))^(3 /4)/(a + b*x^4)^(3/4)) Int[1/(x^3*(1 + a/(b*x^4))^(3/4)), x], x] /; FreeQ [{a, b}, x]
Int[(x_)^(m_.)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> With[{k = GCD[m + 1, n]}, Simp[1/k Subst[Int[x^((m + 1)/k - 1)*(a + b*x^(n/k))^p, x], x, x^k], x] /; k != 1] /; FreeQ[{a, b, p}, x] && IGtQ[n, 0] && IntegerQ[m]
Int[((c_.)*(x_))^(m_)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> Simp[c^(n - 1)*(c*x)^(m - n + 1)*((a + b*x^n)^(p + 1)/(b*(m + n*p + 1))), x] - Simp[ a*c^n*((m - n + 1)/(b*(m + n*p + 1))) Int[(c*x)^(m - n)*(a + b*x^n)^p, x] , x] /; FreeQ[{a, b, c, p}, x] && IGtQ[n, 0] && GtQ[m, n - 1] && NeQ[m + n* p + 1, 0] && IntBinomialQ[a, b, c, n, m, p, x]
Int[(x_)^(m_.)*((a_) + (b_.)*(x_)^(n_))^(p_), x_Symbol] :> -Subst[Int[(a + b/x^n)^p/x^(m + 2), x], x, 1/x] /; FreeQ[{a, b, p}, x] && ILtQ[n, 0] && Int egerQ[m]
\[\int \frac {x^{8}}{\left (b \,x^{4}+a \right )^{\frac {3}{4}}}d x\]
Input:
int(x^8/(b*x^4+a)^(3/4),x)
Output:
int(x^8/(b*x^4+a)^(3/4),x)
\[ \int \frac {x^8}{\left (a+b x^4\right )^{3/4}} \, dx=\int { \frac {x^{8}}{{\left (b x^{4} + a\right )}^{\frac {3}{4}}} \,d x } \] Input:
integrate(x^8/(b*x^4+a)^(3/4),x, algorithm="fricas")
Output:
integral(x^8/(b*x^4 + a)^(3/4), x)
Result contains complex when optimal does not.
Time = 0.51 (sec) , antiderivative size = 37, normalized size of antiderivative = 0.35 \[ \int \frac {x^8}{\left (a+b x^4\right )^{3/4}} \, dx=\frac {x^{9} \Gamma \left (\frac {9}{4}\right ) {{}_{2}F_{1}\left (\begin {matrix} \frac {3}{4}, \frac {9}{4} \\ \frac {13}{4} \end {matrix}\middle | {\frac {b x^{4} e^{i \pi }}{a}} \right )}}{4 a^{\frac {3}{4}} \Gamma \left (\frac {13}{4}\right )} \] Input:
integrate(x**8/(b*x**4+a)**(3/4),x)
Output:
x**9*gamma(9/4)*hyper((3/4, 9/4), (13/4,), b*x**4*exp_polar(I*pi)/a)/(4*a* *(3/4)*gamma(13/4))
\[ \int \frac {x^8}{\left (a+b x^4\right )^{3/4}} \, dx=\int { \frac {x^{8}}{{\left (b x^{4} + a\right )}^{\frac {3}{4}}} \,d x } \] Input:
integrate(x^8/(b*x^4+a)^(3/4),x, algorithm="maxima")
Output:
integrate(x^8/(b*x^4 + a)^(3/4), x)
\[ \int \frac {x^8}{\left (a+b x^4\right )^{3/4}} \, dx=\int { \frac {x^{8}}{{\left (b x^{4} + a\right )}^{\frac {3}{4}}} \,d x } \] Input:
integrate(x^8/(b*x^4+a)^(3/4),x, algorithm="giac")
Output:
integrate(x^8/(b*x^4 + a)^(3/4), x)
Timed out. \[ \int \frac {x^8}{\left (a+b x^4\right )^{3/4}} \, dx=\int \frac {x^8}{{\left (b\,x^4+a\right )}^{3/4}} \,d x \] Input:
int(x^8/(a + b*x^4)^(3/4),x)
Output:
int(x^8/(a + b*x^4)^(3/4), x)
\[ \int \frac {x^8}{\left (a+b x^4\right )^{3/4}} \, dx=\int \frac {x^{8}}{\left (b \,x^{4}+a \right )^{\frac {3}{4}}}d x \] Input:
int(x^8/(b*x^4+a)^(3/4),x)
Output:
int(x**8/(a + b*x**4)**(3/4),x)