Integrand size = 13, antiderivative size = 96 \[ \int f^{a+\frac {b}{x^2}} x^4 \, dx=\frac {1}{5} f^{a+\frac {b}{x^2}} x^5+\frac {2}{15} b f^{a+\frac {b}{x^2}} x^3 \log (f)+\frac {4}{15} b^2 f^{a+\frac {b}{x^2}} x \log ^2(f)-\frac {4}{15} b^{5/2} f^a \sqrt {\pi } \text {erfi}\left (\frac {\sqrt {b} \sqrt {\log (f)}}{x}\right ) \log ^{\frac {5}{2}}(f) \]
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Time = 0.06 (sec) , antiderivative size = 96, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.308, Rules used = {2245, 2237, 2242, 2235} \[ \int f^{a+\frac {b}{x^2}} x^4 \, dx=-\frac {4}{15} \sqrt {\pi } b^{5/2} f^a \log ^{\frac {5}{2}}(f) \text {erfi}\left (\frac {\sqrt {b} \sqrt {\log (f)}}{x}\right )+\frac {4}{15} b^2 x \log ^2(f) f^{a+\frac {b}{x^2}}+\frac {1}{5} x^5 f^{a+\frac {b}{x^2}}+\frac {2}{15} b x^3 \log (f) f^{a+\frac {b}{x^2}} \]
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Rule 2235
Rule 2237
Rule 2242
Rule 2245
Rubi steps \begin{align*} \text {integral}& = \frac {1}{5} f^{a+\frac {b}{x^2}} x^5+\frac {1}{5} (2 b \log (f)) \int f^{a+\frac {b}{x^2}} x^2 \, dx \\ & = \frac {1}{5} f^{a+\frac {b}{x^2}} x^5+\frac {2}{15} b f^{a+\frac {b}{x^2}} x^3 \log (f)+\frac {1}{15} \left (4 b^2 \log ^2(f)\right ) \int f^{a+\frac {b}{x^2}} \, dx \\ & = \frac {1}{5} f^{a+\frac {b}{x^2}} x^5+\frac {2}{15} b f^{a+\frac {b}{x^2}} x^3 \log (f)+\frac {4}{15} b^2 f^{a+\frac {b}{x^2}} x \log ^2(f)+\frac {1}{15} \left (8 b^3 \log ^3(f)\right ) \int \frac {f^{a+\frac {b}{x^2}}}{x^2} \, dx \\ & = \frac {1}{5} f^{a+\frac {b}{x^2}} x^5+\frac {2}{15} b f^{a+\frac {b}{x^2}} x^3 \log (f)+\frac {4}{15} b^2 f^{a+\frac {b}{x^2}} x \log ^2(f)-\frac {1}{15} \left (8 b^3 \log ^3(f)\right ) \text {Subst}\left (\int f^{a+b x^2} \, dx,x,\frac {1}{x}\right ) \\ & = \frac {1}{5} f^{a+\frac {b}{x^2}} x^5+\frac {2}{15} b f^{a+\frac {b}{x^2}} x^3 \log (f)+\frac {4}{15} b^2 f^{a+\frac {b}{x^2}} x \log ^2(f)-\frac {4}{15} b^{5/2} f^a \sqrt {\pi } \text {erfi}\left (\frac {\sqrt {b} \sqrt {\log (f)}}{x}\right ) \log ^{\frac {5}{2}}(f) \\ \end{align*}
Time = 0.02 (sec) , antiderivative size = 74, normalized size of antiderivative = 0.77 \[ \int f^{a+\frac {b}{x^2}} x^4 \, dx=\frac {1}{15} f^a \left (-4 b^{5/2} \sqrt {\pi } \text {erfi}\left (\frac {\sqrt {b} \sqrt {\log (f)}}{x}\right ) \log ^{\frac {5}{2}}(f)+f^{\frac {b}{x^2}} x \left (3 x^4+2 b x^2 \log (f)+4 b^2 \log ^2(f)\right )\right ) \]
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Time = 0.09 (sec) , antiderivative size = 88, normalized size of antiderivative = 0.92
method | result | size |
meijerg | \(-\frac {f^{a} \ln \left (f \right )^{\frac {5}{2}} b^{2} \sqrt {-b}\, \left (-\frac {2 x^{5} \left (\frac {4 b^{2} \ln \left (f \right )^{2}}{3 x^{4}}+\frac {2 b \ln \left (f \right )}{3 x^{2}}+1\right ) {\mathrm e}^{\frac {b \ln \left (f \right )}{x^{2}}}}{5 \left (-b \right )^{\frac {5}{2}} \ln \left (f \right )^{\frac {5}{2}}}+\frac {8 b^{\frac {5}{2}} \sqrt {\pi }\, \operatorname {erfi}\left (\frac {\sqrt {b}\, \sqrt {\ln \left (f \right )}}{x}\right )}{15 \left (-b \right )^{\frac {5}{2}}}\right )}{2}\) | \(88\) |
risch | \(\frac {f^{a} x^{5} f^{\frac {b}{x^{2}}}}{5}+\frac {2 f^{a} \ln \left (f \right ) b \,x^{3} f^{\frac {b}{x^{2}}}}{15}+\frac {4 f^{a} \ln \left (f \right )^{2} b^{2} x \,f^{\frac {b}{x^{2}}}}{15}-\frac {4 f^{a} \ln \left (f \right )^{3} b^{3} \sqrt {\pi }\, \operatorname {erf}\left (\frac {\sqrt {-b \ln \left (f \right )}}{x}\right )}{15 \sqrt {-b \ln \left (f \right )}}\) | \(89\) |
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Time = 0.28 (sec) , antiderivative size = 74, normalized size of antiderivative = 0.77 \[ \int f^{a+\frac {b}{x^2}} x^4 \, dx=\frac {4}{15} \, \sqrt {\pi } \sqrt {-b \log \left (f\right )} b^{2} f^{a} \operatorname {erf}\left (\frac {\sqrt {-b \log \left (f\right )}}{x}\right ) \log \left (f\right )^{2} + \frac {1}{15} \, {\left (3 \, x^{5} + 2 \, b x^{3} \log \left (f\right ) + 4 \, b^{2} x \log \left (f\right )^{2}\right )} f^{\frac {a x^{2} + b}{x^{2}}} \]
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\[ \int f^{a+\frac {b}{x^2}} x^4 \, dx=\int f^{a + \frac {b}{x^{2}}} x^{4}\, dx \]
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Time = 0.22 (sec) , antiderivative size = 28, normalized size of antiderivative = 0.29 \[ \int f^{a+\frac {b}{x^2}} x^4 \, dx=\frac {1}{2} \, f^{a} x^{5} \left (-\frac {b \log \left (f\right )}{x^{2}}\right )^{\frac {5}{2}} \Gamma \left (-\frac {5}{2}, -\frac {b \log \left (f\right )}{x^{2}}\right ) \]
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\[ \int f^{a+\frac {b}{x^2}} x^4 \, dx=\int { f^{a + \frac {b}{x^{2}}} x^{4} \,d x } \]
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Time = 0.21 (sec) , antiderivative size = 107, normalized size of antiderivative = 1.11 \[ \int f^{a+\frac {b}{x^2}} x^4 \, dx=\frac {f^a\,f^{\frac {b}{x^2}}\,x^5}{5}+\frac {4\,f^a\,x^5\,\sqrt {\pi }\,{\left (-\frac {b\,\ln \left (f\right )}{x^2}\right )}^{5/2}}{15}-\frac {4\,f^a\,x^5\,\sqrt {\pi }\,\mathrm {erfc}\left (\sqrt {-\frac {b\,\ln \left (f\right )}{x^2}}\right )\,{\left (-\frac {b\,\ln \left (f\right )}{x^2}\right )}^{5/2}}{15}+\frac {4\,b^2\,f^a\,f^{\frac {b}{x^2}}\,x\,{\ln \left (f\right )}^2}{15}+\frac {2\,b\,f^a\,f^{\frac {b}{x^2}}\,x^3\,\ln \left (f\right )}{15} \]
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