Integrand size = 26, antiderivative size = 119 \[ \int x^8 \left (a^2+2 a b x^3+b^2 x^6\right )^{3/2} \, dx=\frac {a^2 \left (a+b x^3\right )^3 \sqrt {a^2+2 a b x^3+b^2 x^6}}{12 b^3}-\frac {2 a \left (a+b x^3\right )^4 \sqrt {a^2+2 a b x^3+b^2 x^6}}{15 b^3}+\frac {\left (a+b x^3\right )^5 \sqrt {a^2+2 a b x^3+b^2 x^6}}{18 b^3} \]
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Time = 0.04 (sec) , antiderivative size = 167, normalized size of antiderivative = 1.40, number of steps used = 4, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.115, Rules used = {1369, 272, 45} \[ \int x^8 \left (a^2+2 a b x^3+b^2 x^6\right )^{3/2} \, dx=\frac {a b^2 x^{15} \sqrt {a^2+2 a b x^3+b^2 x^6}}{5 \left (a+b x^3\right )}+\frac {a^2 b x^{12} \sqrt {a^2+2 a b x^3+b^2 x^6}}{4 \left (a+b x^3\right )}+\frac {b^3 x^{18} \sqrt {a^2+2 a b x^3+b^2 x^6}}{18 \left (a+b x^3\right )}+\frac {a^3 x^9 \sqrt {a^2+2 a b x^3+b^2 x^6}}{9 \left (a+b x^3\right )} \]
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Rule 45
Rule 272
Rule 1369
Rubi steps \begin{align*} \text {integral}& = \frac {\sqrt {a^2+2 a b x^3+b^2 x^6} \int x^8 \left (a b+b^2 x^3\right )^3 \, dx}{b^2 \left (a b+b^2 x^3\right )} \\ & = \frac {\sqrt {a^2+2 a b x^3+b^2 x^6} \text {Subst}\left (\int x^2 \left (a b+b^2 x\right )^3 \, dx,x,x^3\right )}{3 b^2 \left (a b+b^2 x^3\right )} \\ & = \frac {\sqrt {a^2+2 a b x^3+b^2 x^6} \text {Subst}\left (\int \left (a^3 b^3 x^2+3 a^2 b^4 x^3+3 a b^5 x^4+b^6 x^5\right ) \, dx,x,x^3\right )}{3 b^2 \left (a b+b^2 x^3\right )} \\ & = \frac {a^3 x^9 \sqrt {a^2+2 a b x^3+b^2 x^6}}{9 \left (a+b x^3\right )}+\frac {a^2 b x^{12} \sqrt {a^2+2 a b x^3+b^2 x^6}}{4 \left (a+b x^3\right )}+\frac {a b^2 x^{15} \sqrt {a^2+2 a b x^3+b^2 x^6}}{5 \left (a+b x^3\right )}+\frac {b^3 x^{18} \sqrt {a^2+2 a b x^3+b^2 x^6}}{18 \left (a+b x^3\right )} \\ \end{align*}
Time = 0.52 (sec) , antiderivative size = 113, normalized size of antiderivative = 0.95 \[ \int x^8 \left (a^2+2 a b x^3+b^2 x^6\right )^{3/2} \, dx=\frac {x^9 \left (20 a^3+45 a^2 b x^3+36 a b^2 x^6+10 b^3 x^9\right ) \left (\sqrt {a^2} b x^3+a \left (\sqrt {a^2}-\sqrt {\left (a+b x^3\right )^2}\right )\right )}{180 \left (-a^2-a b x^3+\sqrt {a^2} \sqrt {\left (a+b x^3\right )^2}\right )} \]
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Result contains higher order function than in optimal. Order 9 vs. order 2.
Time = 0.12 (sec) , antiderivative size = 42, normalized size of antiderivative = 0.35
method | result | size |
pseudoelliptic | \(\frac {\operatorname {csgn}\left (b \,x^{3}+a \right ) \left (b \,x^{3}+a \right )^{4} \left (10 b^{2} x^{6}-4 a b \,x^{3}+a^{2}\right )}{180 b^{3}}\) | \(42\) |
gosper | \(\frac {x^{9} \left (10 b^{3} x^{9}+36 b^{2} x^{6} a +45 a^{2} b \,x^{3}+20 a^{3}\right ) {\left (\left (b \,x^{3}+a \right )^{2}\right )}^{\frac {3}{2}}}{180 \left (b \,x^{3}+a \right )^{3}}\) | \(58\) |
default | \(\frac {x^{9} \left (10 b^{3} x^{9}+36 b^{2} x^{6} a +45 a^{2} b \,x^{3}+20 a^{3}\right ) {\left (\left (b \,x^{3}+a \right )^{2}\right )}^{\frac {3}{2}}}{180 \left (b \,x^{3}+a \right )^{3}}\) | \(58\) |
risch | \(\frac {\sqrt {\left (b \,x^{3}+a \right )^{2}}\, a^{3} x^{9}}{9 b \,x^{3}+9 a}+\frac {\sqrt {\left (b \,x^{3}+a \right )^{2}}\, a^{2} b \,x^{12}}{4 b \,x^{3}+4 a}+\frac {\sqrt {\left (b \,x^{3}+a \right )^{2}}\, b^{2} a \,x^{15}}{5 b \,x^{3}+5 a}+\frac {\sqrt {\left (b \,x^{3}+a \right )^{2}}\, b^{3} x^{18}}{18 b \,x^{3}+18 a}\) | \(116\) |
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Time = 0.25 (sec) , antiderivative size = 35, normalized size of antiderivative = 0.29 \[ \int x^8 \left (a^2+2 a b x^3+b^2 x^6\right )^{3/2} \, dx=\frac {1}{18} \, b^{3} x^{18} + \frac {1}{5} \, a b^{2} x^{15} + \frac {1}{4} \, a^{2} b x^{12} + \frac {1}{9} \, a^{3} x^{9} \]
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\[ \int x^8 \left (a^2+2 a b x^3+b^2 x^6\right )^{3/2} \, dx=\int x^{8} \left (\left (a + b x^{3}\right )^{2}\right )^{\frac {3}{2}}\, dx \]
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Time = 0.23 (sec) , antiderivative size = 114, normalized size of antiderivative = 0.96 \[ \int x^8 \left (a^2+2 a b x^3+b^2 x^6\right )^{3/2} \, dx=\frac {{\left (b^{2} x^{6} + 2 \, a b x^{3} + a^{2}\right )}^{\frac {3}{2}} a^{2} x^{3}}{12 \, b^{2}} + \frac {{\left (b^{2} x^{6} + 2 \, a b x^{3} + a^{2}\right )}^{\frac {5}{2}} x^{3}}{18 \, b^{2}} + \frac {{\left (b^{2} x^{6} + 2 \, a b x^{3} + a^{2}\right )}^{\frac {3}{2}} a^{3}}{12 \, b^{3}} - \frac {7 \, {\left (b^{2} x^{6} + 2 \, a b x^{3} + a^{2}\right )}^{\frac {5}{2}} a}{90 \, b^{3}} \]
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Time = 0.31 (sec) , antiderivative size = 67, normalized size of antiderivative = 0.56 \[ \int x^8 \left (a^2+2 a b x^3+b^2 x^6\right )^{3/2} \, dx=\frac {1}{18} \, b^{3} x^{18} \mathrm {sgn}\left (b x^{3} + a\right ) + \frac {1}{5} \, a b^{2} x^{15} \mathrm {sgn}\left (b x^{3} + a\right ) + \frac {1}{4} \, a^{2} b x^{12} \mathrm {sgn}\left (b x^{3} + a\right ) + \frac {1}{9} \, a^{3} x^{9} \mathrm {sgn}\left (b x^{3} + a\right ) \]
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Timed out. \[ \int x^8 \left (a^2+2 a b x^3+b^2 x^6\right )^{3/2} \, dx=\int x^8\,{\left (a^2+2\,a\,b\,x^3+b^2\,x^6\right )}^{3/2} \,d x \]
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