Integrand size = 13, antiderivative size = 119 \[ \int \frac {f^{a+b x^2}}{x^8} \, dx=-\frac {f^{a+b x^2}}{7 x^7}-\frac {2 b f^{a+b x^2} \log (f)}{35 x^5}-\frac {4 b^2 f^{a+b x^2} \log ^2(f)}{105 x^3}-\frac {8 b^3 f^{a+b x^2} \log ^3(f)}{105 x}+\frac {8}{105} b^{7/2} f^a \sqrt {\pi } \text {erfi}\left (\sqrt {b} x \sqrt {\log (f)}\right ) \log ^{\frac {7}{2}}(f) \]
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Time = 0.07 (sec) , antiderivative size = 119, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.154, Rules used = {2245, 2235} \[ \int \frac {f^{a+b x^2}}{x^8} \, dx=\frac {8}{105} \sqrt {\pi } b^{7/2} f^a \log ^{\frac {7}{2}}(f) \text {erfi}\left (\sqrt {b} x \sqrt {\log (f)}\right )-\frac {8 b^3 \log ^3(f) f^{a+b x^2}}{105 x}-\frac {4 b^2 \log ^2(f) f^{a+b x^2}}{105 x^3}-\frac {f^{a+b x^2}}{7 x^7}-\frac {2 b \log (f) f^{a+b x^2}}{35 x^5} \]
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Rule 2235
Rule 2245
Rubi steps \begin{align*} \text {integral}& = -\frac {f^{a+b x^2}}{7 x^7}+\frac {1}{7} (2 b \log (f)) \int \frac {f^{a+b x^2}}{x^6} \, dx \\ & = -\frac {f^{a+b x^2}}{7 x^7}-\frac {2 b f^{a+b x^2} \log (f)}{35 x^5}+\frac {1}{35} \left (4 b^2 \log ^2(f)\right ) \int \frac {f^{a+b x^2}}{x^4} \, dx \\ & = -\frac {f^{a+b x^2}}{7 x^7}-\frac {2 b f^{a+b x^2} \log (f)}{35 x^5}-\frac {4 b^2 f^{a+b x^2} \log ^2(f)}{105 x^3}+\frac {1}{105} \left (8 b^3 \log ^3(f)\right ) \int \frac {f^{a+b x^2}}{x^2} \, dx \\ & = -\frac {f^{a+b x^2}}{7 x^7}-\frac {2 b f^{a+b x^2} \log (f)}{35 x^5}-\frac {4 b^2 f^{a+b x^2} \log ^2(f)}{105 x^3}-\frac {8 b^3 f^{a+b x^2} \log ^3(f)}{105 x}+\frac {1}{105} \left (16 b^4 \log ^4(f)\right ) \int f^{a+b x^2} \, dx \\ & = -\frac {f^{a+b x^2}}{7 x^7}-\frac {2 b f^{a+b x^2} \log (f)}{35 x^5}-\frac {4 b^2 f^{a+b x^2} \log ^2(f)}{105 x^3}-\frac {8 b^3 f^{a+b x^2} \log ^3(f)}{105 x}+\frac {8}{105} b^{7/2} f^a \sqrt {\pi } \text {erfi}\left (\sqrt {b} x \sqrt {\log (f)}\right ) \log ^{\frac {7}{2}}(f) \\ \end{align*}
Time = 0.07 (sec) , antiderivative size = 89, normalized size of antiderivative = 0.75 \[ \int \frac {f^{a+b x^2}}{x^8} \, dx=\frac {f^a \left (8 b^{7/2} \sqrt {\pi } x^7 \text {erfi}\left (\sqrt {b} x \sqrt {\log (f)}\right ) \log ^{\frac {7}{2}}(f)-f^{b x^2} \left (15+6 b x^2 \log (f)+4 b^2 x^4 \log ^2(f)+8 b^3 x^6 \log ^3(f)\right )\right )}{105 x^7} \]
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Time = 0.10 (sec) , antiderivative size = 98, normalized size of antiderivative = 0.82
method | result | size |
meijerg | \(\frac {f^{a} b^{4} \ln \left (f \right )^{\frac {7}{2}} \left (-\frac {2 \left (\frac {8 b^{3} x^{6} \ln \left (f \right )^{3}}{15}+\frac {4 b^{2} x^{4} \ln \left (f \right )^{2}}{15}+\frac {2 b \,x^{2} \ln \left (f \right )}{5}+1\right ) {\mathrm e}^{b \,x^{2} \ln \left (f \right )}}{7 x^{7} \left (-b \right )^{\frac {7}{2}} \ln \left (f \right )^{\frac {7}{2}}}+\frac {16 b^{\frac {7}{2}} \sqrt {\pi }\, \operatorname {erfi}\left (x \sqrt {b}\, \sqrt {\ln \left (f \right )}\right )}{105 \left (-b \right )^{\frac {7}{2}}}\right )}{2 \sqrt {-b}}\) | \(98\) |
risch | \(-\frac {f^{a} f^{b \,x^{2}}}{7 x^{7}}-\frac {2 f^{a} \ln \left (f \right ) b \,f^{b \,x^{2}}}{35 x^{5}}-\frac {4 f^{a} \ln \left (f \right )^{2} b^{2} f^{b \,x^{2}}}{105 x^{3}}-\frac {8 f^{a} \ln \left (f \right )^{3} b^{3} f^{b \,x^{2}}}{105 x}+\frac {8 f^{a} \ln \left (f \right )^{4} b^{4} \sqrt {\pi }\, \operatorname {erf}\left (\sqrt {-b \ln \left (f \right )}\, x \right )}{105 \sqrt {-b \ln \left (f \right )}}\) | \(111\) |
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Time = 0.27 (sec) , antiderivative size = 85, normalized size of antiderivative = 0.71 \[ \int \frac {f^{a+b x^2}}{x^8} \, dx=-\frac {8 \, \sqrt {\pi } \sqrt {-b \log \left (f\right )} b^{3} f^{a} x^{7} \operatorname {erf}\left (\sqrt {-b \log \left (f\right )} x\right ) \log \left (f\right )^{3} + {\left (8 \, b^{3} x^{6} \log \left (f\right )^{3} + 4 \, b^{2} x^{4} \log \left (f\right )^{2} + 6 \, b x^{2} \log \left (f\right ) + 15\right )} f^{b x^{2} + a}}{105 \, x^{7}} \]
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\[ \int \frac {f^{a+b x^2}}{x^8} \, dx=\int \frac {f^{a + b x^{2}}}{x^{8}}\, dx \]
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Time = 0.22 (sec) , antiderivative size = 28, normalized size of antiderivative = 0.24 \[ \int \frac {f^{a+b x^2}}{x^8} \, dx=-\frac {\left (-b x^{2} \log \left (f\right )\right )^{\frac {7}{2}} f^{a} \Gamma \left (-\frac {7}{2}, -b x^{2} \log \left (f\right )\right )}{2 \, x^{7}} \]
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\[ \int \frac {f^{a+b x^2}}{x^8} \, dx=\int { \frac {f^{b x^{2} + a}}{x^{8}} \,d x } \]
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Time = 0.21 (sec) , antiderivative size = 131, normalized size of antiderivative = 1.10 \[ \int \frac {f^{a+b x^2}}{x^8} \, dx=\frac {8\,f^a\,\sqrt {\pi }\,{\left (-b\,x^2\,\ln \left (f\right )\right )}^{7/2}}{105\,x^7}-\frac {f^a\,f^{b\,x^2}}{7\,x^7}-\frac {8\,f^a\,\sqrt {\pi }\,\mathrm {erfc}\left (\sqrt {-b\,x^2\,\ln \left (f\right )}\right )\,{\left (-b\,x^2\,\ln \left (f\right )\right )}^{7/2}}{105\,x^7}-\frac {4\,b^2\,f^a\,f^{b\,x^2}\,{\ln \left (f\right )}^2}{105\,x^3}-\frac {8\,b^3\,f^a\,f^{b\,x^2}\,{\ln \left (f\right )}^3}{105\,x}-\frac {2\,b\,f^a\,f^{b\,x^2}\,\ln \left (f\right )}{35\,x^5} \]
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