Integrand size = 27, antiderivative size = 124 \[ \int \frac {x^2}{\sqrt {a x^2+\sqrt {b+a^2 x^4}}} \, dx=-\frac {b x}{8 a \left (a x^2+\sqrt {b+a^2 x^4}\right )^{3/2}}+\frac {x \sqrt {a x^2+\sqrt {b+a^2 x^4}}}{4 a}-\frac {\sqrt {b} \arctan \left (\frac {\sqrt {2} \sqrt {a} x \sqrt {a x^2+\sqrt {b+a^2 x^4}}}{\sqrt {b}}\right )}{8 \sqrt {2} a^{3/2}} \]
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\[ \int \frac {x^2}{\sqrt {a x^2+\sqrt {b+a^2 x^4}}} \, dx=\int \frac {x^2}{\sqrt {a x^2+\sqrt {b+a^2 x^4}}} \, dx \]
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Rubi steps \begin{align*} \text {integral}& = \int \frac {x^2}{\sqrt {a x^2+\sqrt {b+a^2 x^4}}} \, dx \\ \end{align*}
Time = 0.26 (sec) , antiderivative size = 119, normalized size of antiderivative = 0.96 \[ \int \frac {x^2}{\sqrt {a x^2+\sqrt {b+a^2 x^4}}} \, dx=\frac {x \left (b+4 a x^2 \left (a x^2+\sqrt {b+a^2 x^4}\right )\right )}{8 a \left (a x^2+\sqrt {b+a^2 x^4}\right )^{3/2}}-\frac {\sqrt {b} \arctan \left (\frac {\sqrt {2} \sqrt {a} x \sqrt {a x^2+\sqrt {b+a^2 x^4}}}{\sqrt {b}}\right )}{8 \sqrt {2} a^{3/2}} \]
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\[\int \frac {x^{2}}{\sqrt {a \,x^{2}+\sqrt {a^{2} x^{4}+b}}}d x\]
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none
Time = 1.88 (sec) , antiderivative size = 323, normalized size of antiderivative = 2.60 \[ \int \frac {x^2}{\sqrt {a x^2+\sqrt {b+a^2 x^4}}} \, dx=\left [\frac {\sqrt {\frac {1}{2}} b \sqrt {-\frac {b}{a}} \log \left (4 \, a^{2} b x^{4} - 4 \, \sqrt {a^{2} x^{4} + b} a b x^{2} + b^{2} - 4 \, {\left (2 \, \sqrt {\frac {1}{2}} \sqrt {a^{2} x^{4} + b} a^{2} x^{3} \sqrt {-\frac {b}{a}} - \sqrt {\frac {1}{2}} {\left (2 \, a^{3} x^{5} + a b x\right )} \sqrt {-\frac {b}{a}}\right )} \sqrt {a x^{2} + \sqrt {a^{2} x^{4} + b}}\right ) - 2 \, {\left (2 \, a^{2} x^{5} - 2 \, \sqrt {a^{2} x^{4} + b} a x^{3} - b x\right )} \sqrt {a x^{2} + \sqrt {a^{2} x^{4} + b}}}{16 \, a b}, \frac {\sqrt {\frac {1}{2}} b \sqrt {\frac {b}{a}} \arctan \left (-\frac {{\left (\sqrt {\frac {1}{2}} a x^{2} \sqrt {\frac {b}{a}} - \sqrt {\frac {1}{2}} \sqrt {a^{2} x^{4} + b} \sqrt {\frac {b}{a}}\right )} \sqrt {a x^{2} + \sqrt {a^{2} x^{4} + b}}}{b x}\right ) - {\left (2 \, a^{2} x^{5} - 2 \, \sqrt {a^{2} x^{4} + b} a x^{3} - b x\right )} \sqrt {a x^{2} + \sqrt {a^{2} x^{4} + b}}}{8 \, a b}\right ] \]
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\[ \int \frac {x^2}{\sqrt {a x^2+\sqrt {b+a^2 x^4}}} \, dx=\int \frac {x^{2}}{\sqrt {a x^{2} + \sqrt {a^{2} x^{4} + b}}}\, dx \]
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\[ \int \frac {x^2}{\sqrt {a x^2+\sqrt {b+a^2 x^4}}} \, dx=\int { \frac {x^{2}}{\sqrt {a x^{2} + \sqrt {a^{2} x^{4} + b}}} \,d x } \]
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\[ \int \frac {x^2}{\sqrt {a x^2+\sqrt {b+a^2 x^4}}} \, dx=\int { \frac {x^{2}}{\sqrt {a x^{2} + \sqrt {a^{2} x^{4} + b}}} \,d x } \]
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Timed out. \[ \int \frac {x^2}{\sqrt {a x^2+\sqrt {b+a^2 x^4}}} \, dx=\int \frac {x^2}{\sqrt {\sqrt {a^2\,x^4+b}+a\,x^2}} \,d x \]
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