Integrand size = 20, antiderivative size = 108 \[ \int x^3 \sqrt {a+b x^2+c x^4} \, dx=-\frac {b \left (b+2 c x^2\right ) \sqrt {a+b x^2+c x^4}}{16 c^2}+\frac {\left (a+b x^2+c x^4\right )^{3/2}}{6 c}+\frac {b \left (b^2-4 a c\right ) \text {arctanh}\left (\frac {b+2 c x^2}{2 \sqrt {c} \sqrt {a+b x^2+c x^4}}\right )}{32 c^{5/2}} \]
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Time = 0.06 (sec) , antiderivative size = 108, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 5, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.250, Rules used = {1128, 654, 626, 635, 212} \[ \int x^3 \sqrt {a+b x^2+c x^4} \, dx=\frac {b \left (b^2-4 a c\right ) \text {arctanh}\left (\frac {b+2 c x^2}{2 \sqrt {c} \sqrt {a+b x^2+c x^4}}\right )}{32 c^{5/2}}-\frac {b \left (b+2 c x^2\right ) \sqrt {a+b x^2+c x^4}}{16 c^2}+\frac {\left (a+b x^2+c x^4\right )^{3/2}}{6 c} \]
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Rule 212
Rule 626
Rule 635
Rule 654
Rule 1128
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} \text {Subst}\left (\int x \sqrt {a+b x+c x^2} \, dx,x,x^2\right ) \\ & = \frac {\left (a+b x^2+c x^4\right )^{3/2}}{6 c}-\frac {b \text {Subst}\left (\int \sqrt {a+b x+c x^2} \, dx,x,x^2\right )}{4 c} \\ & = -\frac {b \left (b+2 c x^2\right ) \sqrt {a+b x^2+c x^4}}{16 c^2}+\frac {\left (a+b x^2+c x^4\right )^{3/2}}{6 c}+\frac {\left (b \left (b^2-4 a c\right )\right ) \text {Subst}\left (\int \frac {1}{\sqrt {a+b x+c x^2}} \, dx,x,x^2\right )}{32 c^2} \\ & = -\frac {b \left (b+2 c x^2\right ) \sqrt {a+b x^2+c x^4}}{16 c^2}+\frac {\left (a+b x^2+c x^4\right )^{3/2}}{6 c}+\frac {\left (b \left (b^2-4 a c\right )\right ) \text {Subst}\left (\int \frac {1}{4 c-x^2} \, dx,x,\frac {b+2 c x^2}{\sqrt {a+b x^2+c x^4}}\right )}{16 c^2} \\ & = -\frac {b \left (b+2 c x^2\right ) \sqrt {a+b x^2+c x^4}}{16 c^2}+\frac {\left (a+b x^2+c x^4\right )^{3/2}}{6 c}+\frac {b \left (b^2-4 a c\right ) \tanh ^{-1}\left (\frac {b+2 c x^2}{2 \sqrt {c} \sqrt {a+b x^2+c x^4}}\right )}{32 c^{5/2}} \\ \end{align*}
Time = 0.20 (sec) , antiderivative size = 103, normalized size of antiderivative = 0.95 \[ \int x^3 \sqrt {a+b x^2+c x^4} \, dx=\frac {2 \sqrt {c} \sqrt {a+b x^2+c x^4} \left (-3 b^2+2 b c x^2+8 c \left (a+c x^4\right )\right )-3 \left (b^3-4 a b c\right ) \log \left (c^2 \left (b+2 c x^2-2 \sqrt {c} \sqrt {a+b x^2+c x^4}\right )\right )}{96 c^{5/2}} \]
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Time = 0.09 (sec) , antiderivative size = 91, normalized size of antiderivative = 0.84
method | result | size |
risch | \(\frac {\left (8 c^{2} x^{4}+2 b c \,x^{2}+8 a c -3 b^{2}\right ) \sqrt {c \,x^{4}+b \,x^{2}+a}}{48 c^{2}}-\frac {b \left (4 a c -b^{2}\right ) \ln \left (\frac {\frac {b}{2}+c \,x^{2}}{\sqrt {c}}+\sqrt {c \,x^{4}+b \,x^{2}+a}\right )}{32 c^{\frac {5}{2}}}\) | \(91\) |
default | \(\frac {\left (c \,x^{4}+b \,x^{2}+a \right )^{\frac {3}{2}}}{6 c}-\frac {b \left (\frac {\left (2 c \,x^{2}+b \right ) \sqrt {c \,x^{4}+b \,x^{2}+a}}{4 c}+\frac {\left (4 a c -b^{2}\right ) \ln \left (\frac {\frac {b}{2}+c \,x^{2}}{\sqrt {c}}+\sqrt {c \,x^{4}+b \,x^{2}+a}\right )}{8 c^{\frac {3}{2}}}\right )}{4 c}\) | \(99\) |
elliptic | \(\frac {\left (c \,x^{4}+b \,x^{2}+a \right )^{\frac {3}{2}}}{6 c}-\frac {b \left (\frac {\left (2 c \,x^{2}+b \right ) \sqrt {c \,x^{4}+b \,x^{2}+a}}{4 c}+\frac {\left (4 a c -b^{2}\right ) \ln \left (\frac {\frac {b}{2}+c \,x^{2}}{\sqrt {c}}+\sqrt {c \,x^{4}+b \,x^{2}+a}\right )}{8 c^{\frac {3}{2}}}\right )}{4 c}\) | \(99\) |
pseudoelliptic | \(\frac {16 c^{\frac {5}{2}} x^{4} \sqrt {c \,x^{4}+b \,x^{2}+a}+4 b \,c^{\frac {3}{2}} x^{2} \sqrt {c \,x^{4}+b \,x^{2}+a}+12 \ln \left (2\right ) a b c -3 \ln \left (2\right ) b^{3}-12 \ln \left (\frac {2 c \,x^{2}+2 \sqrt {c \,x^{4}+b \,x^{2}+a}\, \sqrt {c}+b}{\sqrt {c}}\right ) a b c +3 \ln \left (\frac {2 c \,x^{2}+2 \sqrt {c \,x^{4}+b \,x^{2}+a}\, \sqrt {c}+b}{\sqrt {c}}\right ) b^{3}+16 a \,c^{\frac {3}{2}} \sqrt {c \,x^{4}+b \,x^{2}+a}-6 b^{2} \sqrt {c}\, \sqrt {c \,x^{4}+b \,x^{2}+a}}{96 c^{\frac {5}{2}}}\) | \(182\) |
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Time = 0.26 (sec) , antiderivative size = 237, normalized size of antiderivative = 2.19 \[ \int x^3 \sqrt {a+b x^2+c x^4} \, dx=\left [-\frac {3 \, {\left (b^{3} - 4 \, a b c\right )} \sqrt {c} \log \left (-8 \, c^{2} x^{4} - 8 \, b c x^{2} - b^{2} + 4 \, \sqrt {c x^{4} + b x^{2} + a} {\left (2 \, c x^{2} + b\right )} \sqrt {c} - 4 \, a c\right ) - 4 \, {\left (8 \, c^{3} x^{4} + 2 \, b c^{2} x^{2} - 3 \, b^{2} c + 8 \, a c^{2}\right )} \sqrt {c x^{4} + b x^{2} + a}}{192 \, c^{3}}, -\frac {3 \, {\left (b^{3} - 4 \, a b c\right )} \sqrt {-c} \arctan \left (\frac {\sqrt {c x^{4} + b x^{2} + a} {\left (2 \, c x^{2} + b\right )} \sqrt {-c}}{2 \, {\left (c^{2} x^{4} + b c x^{2} + a c\right )}}\right ) - 2 \, {\left (8 \, c^{3} x^{4} + 2 \, b c^{2} x^{2} - 3 \, b^{2} c + 8 \, a c^{2}\right )} \sqrt {c x^{4} + b x^{2} + a}}{96 \, c^{3}}\right ] \]
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\[ \int x^3 \sqrt {a+b x^2+c x^4} \, dx=\int x^{3} \sqrt {a + b x^{2} + c x^{4}}\, dx \]
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Exception generated. \[ \int x^3 \sqrt {a+b x^2+c x^4} \, dx=\text {Exception raised: ValueError} \]
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Time = 0.32 (sec) , antiderivative size = 96, normalized size of antiderivative = 0.89 \[ \int x^3 \sqrt {a+b x^2+c x^4} \, dx=\frac {1}{48} \, \sqrt {c x^{4} + b x^{2} + a} {\left (2 \, {\left (4 \, x^{2} + \frac {b}{c}\right )} x^{2} - \frac {3 \, b^{2} - 8 \, a c}{c^{2}}\right )} - \frac {{\left (b^{3} - 4 \, a b c\right )} \log \left ({\left | 2 \, {\left (\sqrt {c} x^{2} - \sqrt {c x^{4} + b x^{2} + a}\right )} \sqrt {c} + b \right |}\right )}{32 \, c^{\frac {5}{2}}} \]
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Time = 13.07 (sec) , antiderivative size = 87, normalized size of antiderivative = 0.81 \[ \int x^3 \sqrt {a+b x^2+c x^4} \, dx=\frac {\left (8\,c\,\left (c\,x^4+a\right )-3\,b^2+2\,b\,c\,x^2\right )\,\sqrt {c\,x^4+b\,x^2+a}}{48\,c^2}+\frac {\ln \left (2\,\sqrt {c\,x^4+b\,x^2+a}+\frac {2\,c\,x^2+b}{\sqrt {c}}\right )\,\left (b^3-4\,a\,b\,c\right )}{32\,c^{5/2}} \]
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