Integrand size = 26, antiderivative size = 79 \[ \int x^5 \sqrt {a^2+2 a b x^2+b^2 x^4} \, dx=\frac {a x^6 \sqrt {a^2+2 a b x^2+b^2 x^4}}{6 \left (a+b x^2\right )}+\frac {b x^8 \sqrt {a^2+2 a b x^2+b^2 x^4}}{8 \left (a+b x^2\right )} \]
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Time = 0.04 (sec) , antiderivative size = 79, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.115, Rules used = {1125, 660, 45} \[ \int x^5 \sqrt {a^2+2 a b x^2+b^2 x^4} \, dx=\frac {b x^8 \sqrt {a^2+2 a b x^2+b^2 x^4}}{8 \left (a+b x^2\right )}+\frac {a x^6 \sqrt {a^2+2 a b x^2+b^2 x^4}}{6 \left (a+b x^2\right )} \]
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Rule 45
Rule 660
Rule 1125
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} \text {Subst}\left (\int x^2 \sqrt {a^2+2 a b x+b^2 x^2} \, dx,x,x^2\right ) \\ & = \frac {\sqrt {a^2+2 a b x^2+b^2 x^4} \text {Subst}\left (\int x^2 \left (a b+b^2 x\right ) \, dx,x,x^2\right )}{2 \left (a b+b^2 x^2\right )} \\ & = \frac {\sqrt {a^2+2 a b x^2+b^2 x^4} \text {Subst}\left (\int \left (a b x^2+b^2 x^3\right ) \, dx,x,x^2\right )}{2 \left (a b+b^2 x^2\right )} \\ & = \frac {a x^6 \sqrt {a^2+2 a b x^2+b^2 x^4}}{6 \left (a+b x^2\right )}+\frac {b x^8 \sqrt {a^2+2 a b x^2+b^2 x^4}}{8 \left (a+b x^2\right )} \\ \end{align*}
Time = 0.39 (sec) , antiderivative size = 91, normalized size of antiderivative = 1.15 \[ \int x^5 \sqrt {a^2+2 a b x^2+b^2 x^4} \, dx=\frac {x^6 \left (4 a+3 b x^2\right ) \left (\sqrt {a^2} b x^2+a \left (\sqrt {a^2}-\sqrt {\left (a+b x^2\right )^2}\right )\right )}{24 \left (-a^2-a b x^2+\sqrt {a^2} \sqrt {\left (a+b x^2\right )^2}\right )} \]
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Result contains higher order function than in optimal. Order 9 vs. order 2.
Time = 0.12 (sec) , antiderivative size = 24, normalized size of antiderivative = 0.30
method | result | size |
pseudoelliptic | \(\frac {x^{6} \left (3 b \,x^{2}+4 a \right ) \operatorname {csgn}\left (b \,x^{2}+a \right )}{24}\) | \(24\) |
gosper | \(\frac {x^{6} \left (3 b \,x^{2}+4 a \right ) \sqrt {\left (b \,x^{2}+a \right )^{2}}}{24 b \,x^{2}+24 a}\) | \(36\) |
default | \(\frac {x^{6} \left (3 b \,x^{2}+4 a \right ) \sqrt {\left (b \,x^{2}+a \right )^{2}}}{24 b \,x^{2}+24 a}\) | \(36\) |
risch | \(\frac {a \,x^{6} \sqrt {\left (b \,x^{2}+a \right )^{2}}}{6 b \,x^{2}+6 a}+\frac {b \,x^{8} \sqrt {\left (b \,x^{2}+a \right )^{2}}}{8 b \,x^{2}+8 a}\) | \(54\) |
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Time = 0.25 (sec) , antiderivative size = 13, normalized size of antiderivative = 0.16 \[ \int x^5 \sqrt {a^2+2 a b x^2+b^2 x^4} \, dx=\frac {1}{8} \, b x^{8} + \frac {1}{6} \, a x^{6} \]
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\[ \int x^5 \sqrt {a^2+2 a b x^2+b^2 x^4} \, dx=\int x^{5} \sqrt {\left (a + b x^{2}\right )^{2}}\, dx \]
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Time = 0.19 (sec) , antiderivative size = 13, normalized size of antiderivative = 0.16 \[ \int x^5 \sqrt {a^2+2 a b x^2+b^2 x^4} \, dx=\frac {1}{8} \, b x^{8} + \frac {1}{6} \, a x^{6} \]
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Time = 0.26 (sec) , antiderivative size = 29, normalized size of antiderivative = 0.37 \[ \int x^5 \sqrt {a^2+2 a b x^2+b^2 x^4} \, dx=\frac {1}{8} \, b x^{8} \mathrm {sgn}\left (b x^{2} + a\right ) + \frac {1}{6} \, a x^{6} \mathrm {sgn}\left (b x^{2} + a\right ) \]
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Time = 13.32 (sec) , antiderivative size = 71, normalized size of antiderivative = 0.90 \[ \int x^5 \sqrt {a^2+2 a b x^2+b^2 x^4} \, dx=\frac {\sqrt {a^2+2\,a\,b\,x^2+b^2\,x^4}\,\left (a^3-4\,a^2\,b\,x^2-5\,a\,b^2\,x^4+3\,b\,x^2\,\left (a^2+2\,a\,b\,x^2+b^2\,x^4\right )\right )}{24\,b^3} \]
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