Integrand size = 13, antiderivative size = 73 \[ \int \frac {f^{a+b x^2}}{x^4} \, dx=-\frac {f^{a+b x^2}}{3 x^3}-\frac {2 b f^{a+b x^2} \log (f)}{3 x}+\frac {2}{3} b^{3/2} f^a \sqrt {\pi } \text {erfi}\left (\sqrt {b} x \sqrt {\log (f)}\right ) \log ^{\frac {3}{2}}(f) \]
[Out]
Time = 0.04 (sec) , antiderivative size = 73, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.154, Rules used = {2245, 2235} \[ \int \frac {f^{a+b x^2}}{x^4} \, dx=\frac {2}{3} \sqrt {\pi } b^{3/2} f^a \log ^{\frac {3}{2}}(f) \text {erfi}\left (\sqrt {b} x \sqrt {\log (f)}\right )-\frac {2 b \log (f) f^{a+b x^2}}{3 x}-\frac {f^{a+b x^2}}{3 x^3} \]
[In]
[Out]
Rule 2235
Rule 2245
Rubi steps \begin{align*} \text {integral}& = -\frac {f^{a+b x^2}}{3 x^3}+\frac {1}{3} (2 b \log (f)) \int \frac {f^{a+b x^2}}{x^2} \, dx \\ & = -\frac {f^{a+b x^2}}{3 x^3}-\frac {2 b f^{a+b x^2} \log (f)}{3 x}+\frac {1}{3} \left (4 b^2 \log ^2(f)\right ) \int f^{a+b x^2} \, dx \\ & = -\frac {f^{a+b x^2}}{3 x^3}-\frac {2 b f^{a+b x^2} \log (f)}{3 x}+\frac {2}{3} b^{3/2} f^a \sqrt {\pi } \text {erfi}\left (\sqrt {b} x \sqrt {\log (f)}\right ) \log ^{\frac {3}{2}}(f) \\ \end{align*}
Time = 0.07 (sec) , antiderivative size = 62, normalized size of antiderivative = 0.85 \[ \int \frac {f^{a+b x^2}}{x^4} \, dx=\frac {1}{3} f^a \left (2 b^{3/2} \sqrt {\pi } \text {erfi}\left (\sqrt {b} x \sqrt {\log (f)}\right ) \log ^{\frac {3}{2}}(f)-\frac {f^{b x^2} \left (1+2 b x^2 \log (f)\right )}{x^3}\right ) \]
[In]
[Out]
Time = 0.04 (sec) , antiderivative size = 67, normalized size of antiderivative = 0.92
method | result | size |
risch | \(-\frac {f^{a} f^{b \,x^{2}}}{3 x^{3}}-\frac {2 f^{a} f^{b \,x^{2}} \ln \left (f \right ) b}{3 x}+\frac {2 f^{a} \ln \left (f \right )^{2} b^{2} \sqrt {\pi }\, \operatorname {erf}\left (\sqrt {-b \ln \left (f \right )}\, x \right )}{3 \sqrt {-b \ln \left (f \right )}}\) | \(67\) |
meijerg | \(\frac {f^{a} \ln \left (f \right )^{\frac {3}{2}} b^{2} \left (-\frac {2 \left (2 b \,x^{2} \ln \left (f \right )+1\right ) {\mathrm e}^{b \,x^{2} \ln \left (f \right )}}{3 x^{3} \left (-b \right )^{\frac {3}{2}} \ln \left (f \right )^{\frac {3}{2}}}+\frac {4 b^{\frac {3}{2}} \sqrt {\pi }\, \operatorname {erfi}\left (x \sqrt {b}\, \sqrt {\ln \left (f \right )}\right )}{3 \left (-b \right )^{\frac {3}{2}}}\right )}{2 \sqrt {-b}}\) | \(74\) |
[In]
[Out]
none
Time = 0.27 (sec) , antiderivative size = 57, normalized size of antiderivative = 0.78 \[ \int \frac {f^{a+b x^2}}{x^4} \, dx=-\frac {2 \, \sqrt {\pi } \sqrt {-b \log \left (f\right )} b f^{a} x^{3} \operatorname {erf}\left (\sqrt {-b \log \left (f\right )} x\right ) \log \left (f\right ) + {\left (2 \, b x^{2} \log \left (f\right ) + 1\right )} f^{b x^{2} + a}}{3 \, x^{3}} \]
[In]
[Out]
\[ \int \frac {f^{a+b x^2}}{x^4} \, dx=\int \frac {f^{a + b x^{2}}}{x^{4}}\, dx \]
[In]
[Out]
none
Time = 0.23 (sec) , antiderivative size = 28, normalized size of antiderivative = 0.38 \[ \int \frac {f^{a+b x^2}}{x^4} \, dx=-\frac {\left (-b x^{2} \log \left (f\right )\right )^{\frac {3}{2}} f^{a} \Gamma \left (-\frac {3}{2}, -b x^{2} \log \left (f\right )\right )}{2 \, x^{3}} \]
[In]
[Out]
\[ \int \frac {f^{a+b x^2}}{x^4} \, dx=\int { \frac {f^{b x^{2} + a}}{x^{4}} \,d x } \]
[In]
[Out]
Time = 0.23 (sec) , antiderivative size = 70, normalized size of antiderivative = 0.96 \[ \int \frac {f^{a+b x^2}}{x^4} \, dx=\frac {2\,b^2\,f^a\,\sqrt {\pi }\,\mathrm {erfi}\left (\frac {b\,x\,\ln \left (f\right )}{\sqrt {b\,\ln \left (f\right )}}\right )\,{\ln \left (f\right )}^2}{3\,\sqrt {b\,\ln \left (f\right )}}-\frac {\frac {f^a\,f^{b\,x^2}}{3}+\frac {2\,b\,f^a\,f^{b\,x^2}\,x^2\,\ln \left (f\right )}{3}}{x^3} \]
[In]
[Out]