Optimal. Leaf size=58 \[ \frac {\sqrt {a x^2+b x^4}}{2 b}-\frac {a \tanh ^{-1}\left (\frac {\sqrt {b} x^2}{\sqrt {a x^2+b x^4}}\right )}{2 b^{3/2}} \]
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Rubi [A] time = 0.08, antiderivative size = 58, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, integrand size = 19, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.210, Rules used = {2018, 640, 620, 206} \[ \frac {\sqrt {a x^2+b x^4}}{2 b}-\frac {a \tanh ^{-1}\left (\frac {\sqrt {b} x^2}{\sqrt {a x^2+b x^4}}\right )}{2 b^{3/2}} \]
Antiderivative was successfully verified.
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Rule 206
Rule 620
Rule 640
Rule 2018
Rubi steps
\begin {align*} \int \frac {x^3}{\sqrt {a x^2+b x^4}} \, dx &=\frac {1}{2} \operatorname {Subst}\left (\int \frac {x}{\sqrt {a x+b x^2}} \, dx,x,x^2\right )\\ &=\frac {\sqrt {a x^2+b x^4}}{2 b}-\frac {a \operatorname {Subst}\left (\int \frac {1}{\sqrt {a x+b x^2}} \, dx,x,x^2\right )}{4 b}\\ &=\frac {\sqrt {a x^2+b x^4}}{2 b}-\frac {a \operatorname {Subst}\left (\int \frac {1}{1-b x^2} \, dx,x,\frac {x^2}{\sqrt {a x^2+b x^4}}\right )}{2 b}\\ &=\frac {\sqrt {a x^2+b x^4}}{2 b}-\frac {a \tanh ^{-1}\left (\frac {\sqrt {b} x^2}{\sqrt {a x^2+b x^4}}\right )}{2 b^{3/2}}\\ \end {align*}
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Mathematica [A] time = 0.03, size = 73, normalized size = 1.26 \[ \frac {x \left (\sqrt {b} x \left (a+b x^2\right )-a \sqrt {a+b x^2} \tanh ^{-1}\left (\frac {\sqrt {b} x}{\sqrt {a+b x^2}}\right )\right )}{2 b^{3/2} \sqrt {x^2 \left (a+b x^2\right )}} \]
Antiderivative was successfully verified.
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fricas [A] time = 0.57, size = 114, normalized size = 1.97 \[ \left [\frac {a \sqrt {b} \log \left (-2 \, b x^{2} - a + 2 \, \sqrt {b x^{4} + a x^{2}} \sqrt {b}\right ) + 2 \, \sqrt {b x^{4} + a x^{2}} b}{4 \, b^{2}}, \frac {a \sqrt {-b} \arctan \left (\frac {\sqrt {b x^{4} + a x^{2}} \sqrt {-b}}{b x^{2} + a}\right ) + \sqrt {b x^{4} + a x^{2}} b}{2 \, b^{2}}\right ] \]
Verification of antiderivative is not currently implemented for this CAS.
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giac [A] time = 0.20, size = 59, normalized size = 1.02 \[ \frac {a \log \left ({\left | -2 \, {\left (\sqrt {b} x^{2} - \sqrt {b x^{4} + a x^{2}}\right )} \sqrt {b} - a \right |}\right )}{4 \, b^{\frac {3}{2}}} + \frac {\sqrt {b x^{4} + a x^{2}}}{2 \, b} \]
Verification of antiderivative is not currently implemented for this CAS.
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maple [A] time = 0.01, size = 64, normalized size = 1.10 \[ \frac {\sqrt {b \,x^{2}+a}\, \left (-a b \ln \left (\sqrt {b}\, x +\sqrt {b \,x^{2}+a}\right )+\sqrt {b \,x^{2}+a}\, b^{\frac {3}{2}} x \right ) x}{2 \sqrt {b \,x^{4}+a \,x^{2}}\, b^{\frac {5}{2}}} \]
Verification of antiderivative is not currently implemented for this CAS.
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maxima [A] time = 1.42, size = 52, normalized size = 0.90 \[ -\frac {a \log \left (2 \, b x^{2} + a + 2 \, \sqrt {b x^{4} + a x^{2}} \sqrt {b}\right )}{4 \, b^{\frac {3}{2}}} + \frac {\sqrt {b x^{4} + a x^{2}}}{2 \, b} \]
Verification of antiderivative is not currently implemented for this CAS.
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mupad [B] time = 4.71, size = 53, normalized size = 0.91 \[ \frac {\sqrt {b\,x^4+a\,x^2}}{2\,b}-\frac {a\,\ln \left (\frac {b\,x^2+\frac {a}{2}}{\sqrt {b}}+\sqrt {b\,x^4+a\,x^2}\right )}{4\,b^{3/2}} \]
Verification of antiderivative is not currently implemented for this CAS.
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sympy [F] time = 0.00, size = 0, normalized size = 0.00 \[ \int \frac {x^{3}}{\sqrt {x^{2} \left (a + b x^{2}\right )}}\, dx \]
Verification of antiderivative is not currently implemented for this CAS.
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