Optimal. Leaf size=44 \[ \frac {\left (a+b x^4\right ) \tanh ^{-1}\left (a+b x^4\right )}{4 b}+\frac {\log \left (1-\left (a+b x^4\right )^2\right )}{8 b} \]
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Rubi [A]
time = 0.03, antiderivative size = 44, normalized size of antiderivative = 1.00, number of steps
used = 4, number of rules used = 4, integrand size = 12, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.333, Rules used = {6847, 6238,
6021, 266} \begin {gather*} \frac {\log \left (1-\left (a+b x^4\right )^2\right )}{8 b}+\frac {\left (a+b x^4\right ) \tanh ^{-1}\left (a+b x^4\right )}{4 b} \end {gather*}
Antiderivative was successfully verified.
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Rule 266
Rule 6021
Rule 6238
Rule 6847
Rubi steps
\begin {align*} \int x^3 \tanh ^{-1}\left (a+b x^4\right ) \, dx &=\frac {1}{4} \text {Subst}\left (\int \tanh ^{-1}(a+b x) \, dx,x,x^4\right )\\ &=\frac {\text {Subst}\left (\int \tanh ^{-1}(x) \, dx,x,a+b x^4\right )}{4 b}\\ &=\frac {\left (a+b x^4\right ) \tanh ^{-1}\left (a+b x^4\right )}{4 b}-\frac {\text {Subst}\left (\int \frac {x}{1-x^2} \, dx,x,a+b x^4\right )}{4 b}\\ &=\frac {\left (a+b x^4\right ) \tanh ^{-1}\left (a+b x^4\right )}{4 b}+\frac {\log \left (1-\left (a+b x^4\right )^2\right )}{8 b}\\ \end {align*}
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Mathematica [A]
time = 0.01, size = 39, normalized size = 0.89 \begin {gather*} \frac {2 \left (a+b x^4\right ) \tanh ^{-1}\left (a+b x^4\right )+\log \left (1-\left (a+b x^4\right )^2\right )}{8 b} \end {gather*}
Antiderivative was successfully verified.
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Maple [A]
time = 0.04, size = 39, normalized size = 0.89
method | result | size |
derivativedivides | \(\frac {\left (b \,x^{4}+a \right ) \arctanh \left (b \,x^{4}+a \right )+\frac {\ln \left (1-\left (b \,x^{4}+a \right )^{2}\right )}{2}}{4 b}\) | \(39\) |
default | \(\frac {\left (b \,x^{4}+a \right ) \arctanh \left (b \,x^{4}+a \right )+\frac {\ln \left (1-\left (b \,x^{4}+a \right )^{2}\right )}{2}}{4 b}\) | \(39\) |
risch | \(\frac {x^{4} \ln \left (b \,x^{4}+a +1\right )}{8}-\frac {x^{4} \ln \left (-b \,x^{4}-a +1\right )}{8}+\frac {\ln \left (b \,x^{4}+a +1\right ) a}{8 b}-\frac {\ln \left (-b \,x^{4}-a +1\right ) a}{8 b}+\frac {\ln \left (b \,x^{4}+a +1\right )}{8 b}+\frac {\ln \left (-b \,x^{4}-a +1\right )}{8 b}\) | \(97\) |
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A]
time = 0.25, size = 37, normalized size = 0.84 \begin {gather*} \frac {2 \, {\left (b x^{4} + a\right )} \operatorname {artanh}\left (b x^{4} + a\right ) + \log \left (-{\left (b x^{4} + a\right )}^{2} + 1\right )}{8 \, b} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A]
time = 0.37, size = 59, normalized size = 1.34 \begin {gather*} \frac {b x^{4} \log \left (-\frac {b x^{4} + a + 1}{b x^{4} + a - 1}\right ) + {\left (a + 1\right )} \log \left (b x^{4} + a + 1\right ) - {\left (a - 1\right )} \log \left (b x^{4} + a - 1\right )}{8 \, b} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A]
time = 0.98, size = 60, normalized size = 1.36 \begin {gather*} \begin {cases} \frac {a \operatorname {atanh}{\left (a + b x^{4} \right )}}{4 b} + \frac {x^{4} \operatorname {atanh}{\left (a + b x^{4} \right )}}{4} + \frac {\log {\left (a + b x^{4} + 1 \right )}}{4 b} - \frac {\operatorname {atanh}{\left (a + b x^{4} \right )}}{4 b} & \text {for}\: b \neq 0 \\\frac {x^{4} \operatorname {atanh}{\left (a \right )}}{4} & \text {otherwise} \end {cases} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [B] Leaf count of result is larger than twice the leaf count of optimal. 223 vs.
\(2 (40) = 80\).
time = 0.41, size = 223, normalized size = 5.07 \begin {gather*} \frac {1}{8} \, {\left ({\left (a + 1\right )} b - {\left (a - 1\right )} b\right )} {\left (\frac {\log \left (\frac {{\left | -b x^{4} - a - 1 \right |}}{{\left | b x^{4} + a - 1 \right |}}\right )}{b^{2}} - \frac {\log \left ({\left | -\frac {b x^{4} + a + 1}{b x^{4} + a - 1} + 1 \right |}\right )}{b^{2}} + \frac {\log \left (-\frac {a - \frac {{\left (\frac {{\left (b x^{4} + a + 1\right )} {\left (a - 1\right )}}{b x^{4} + a - 1} - a - 1\right )} b}{\frac {{\left (b x^{4} + a + 1\right )} b}{b x^{4} + a - 1} - b} + 1}{a - \frac {{\left (\frac {{\left (b x^{4} + a + 1\right )} {\left (a - 1\right )}}{b x^{4} + a - 1} - a - 1\right )} b}{\frac {{\left (b x^{4} + a + 1\right )} b}{b x^{4} + a - 1} - b} - 1}\right )}{b^{2} {\left (\frac {b x^{4} + a + 1}{b x^{4} + a - 1} - 1\right )}}\right )} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [B]
time = 0.32, size = 90, normalized size = 2.05 \begin {gather*} \frac {\ln \left (b\,x^4+a-1\right )}{8\,b}-\frac {x^4\,\ln \left (-b\,x^4-a+1\right )}{8}+\frac {\ln \left (b\,x^4+a+1\right )}{8\,b}+\frac {x^4\,\ln \left (b\,x^4+a+1\right )}{8}-\frac {a\,\ln \left (b\,x^4+a-1\right )}{8\,b}+\frac {a\,\ln \left (b\,x^4+a+1\right )}{8\,b} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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