Optimal. Leaf size=139 \[ -\frac {\sqrt [4]{1-a x} (1+a x)^{3/4}}{3 x^3}+\frac {5 a \sqrt [4]{1-a x} (1+a x)^{3/4}}{12 x^2}-\frac {11 a^2 \sqrt [4]{1-a x} (1+a x)^{3/4}}{24 x}-\frac {3}{8} a^3 \text {ArcTan}\left (\frac {\sqrt [4]{1+a x}}{\sqrt [4]{1-a x}}\right )+\frac {3}{8} a^3 \tanh ^{-1}\left (\frac {\sqrt [4]{1+a x}}{\sqrt [4]{1-a x}}\right ) \]
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Rubi [A]
time = 0.04, antiderivative size = 139, normalized size of antiderivative = 1.00, number of steps
used = 9, number of rules used = 8, integrand size = 14, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.571, Rules used = {6261, 101, 156,
12, 95, 304, 209, 212} \begin {gather*} -\frac {3}{8} a^3 \text {ArcTan}\left (\frac {\sqrt [4]{a x+1}}{\sqrt [4]{1-a x}}\right )+\frac {3}{8} a^3 \tanh ^{-1}\left (\frac {\sqrt [4]{a x+1}}{\sqrt [4]{1-a x}}\right )-\frac {11 a^2 \sqrt [4]{1-a x} (a x+1)^{3/4}}{24 x}-\frac {\sqrt [4]{1-a x} (a x+1)^{3/4}}{3 x^3}+\frac {5 a \sqrt [4]{1-a x} (a x+1)^{3/4}}{12 x^2} \end {gather*}
Antiderivative was successfully verified.
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Rule 12
Rule 95
Rule 101
Rule 156
Rule 209
Rule 212
Rule 304
Rule 6261
Rubi steps
\begin {align*} \int \frac {e^{-\frac {1}{2} \tanh ^{-1}(a x)}}{x^4} \, dx &=\int \frac {\sqrt [4]{1-a x}}{x^4 \sqrt [4]{1+a x}} \, dx\\ &=-\frac {\sqrt [4]{1-a x} (1+a x)^{3/4}}{3 x^3}+\frac {1}{3} \int \frac {-\frac {5 a}{2}+2 a^2 x}{x^3 (1-a x)^{3/4} \sqrt [4]{1+a x}} \, dx\\ &=-\frac {\sqrt [4]{1-a x} (1+a x)^{3/4}}{3 x^3}+\frac {5 a \sqrt [4]{1-a x} (1+a x)^{3/4}}{12 x^2}-\frac {1}{6} \int \frac {-\frac {11 a^2}{4}+\frac {5 a^3 x}{2}}{x^2 (1-a x)^{3/4} \sqrt [4]{1+a x}} \, dx\\ &=-\frac {\sqrt [4]{1-a x} (1+a x)^{3/4}}{3 x^3}+\frac {5 a \sqrt [4]{1-a x} (1+a x)^{3/4}}{12 x^2}-\frac {11 a^2 \sqrt [4]{1-a x} (1+a x)^{3/4}}{24 x}+\frac {1}{6} \int -\frac {9 a^3}{8 x (1-a x)^{3/4} \sqrt [4]{1+a x}} \, dx\\ &=-\frac {\sqrt [4]{1-a x} (1+a x)^{3/4}}{3 x^3}+\frac {5 a \sqrt [4]{1-a x} (1+a x)^{3/4}}{12 x^2}-\frac {11 a^2 \sqrt [4]{1-a x} (1+a x)^{3/4}}{24 x}-\frac {1}{16} \left (3 a^3\right ) \int \frac {1}{x (1-a x)^{3/4} \sqrt [4]{1+a x}} \, dx\\ &=-\frac {\sqrt [4]{1-a x} (1+a x)^{3/4}}{3 x^3}+\frac {5 a \sqrt [4]{1-a x} (1+a x)^{3/4}}{12 x^2}-\frac {11 a^2 \sqrt [4]{1-a x} (1+a x)^{3/4}}{24 x}-\frac {1}{4} \left (3 a^3\right ) \text {Subst}\left (\int \frac {x^2}{-1+x^4} \, dx,x,\frac {\sqrt [4]{1+a x}}{\sqrt [4]{1-a x}}\right )\\ &=-\frac {\sqrt [4]{1-a x} (1+a x)^{3/4}}{3 x^3}+\frac {5 a \sqrt [4]{1-a x} (1+a x)^{3/4}}{12 x^2}-\frac {11 a^2 \sqrt [4]{1-a x} (1+a x)^{3/4}}{24 x}+\frac {1}{8} \left (3 a^3\right ) \text {Subst}\left (\int \frac {1}{1-x^2} \, dx,x,\frac {\sqrt [4]{1+a x}}{\sqrt [4]{1-a x}}\right )-\frac {1}{8} \left (3 a^3\right ) \text {Subst}\left (\int \frac {1}{1+x^2} \, dx,x,\frac {\sqrt [4]{1+a x}}{\sqrt [4]{1-a x}}\right )\\ &=-\frac {\sqrt [4]{1-a x} (1+a x)^{3/4}}{3 x^3}+\frac {5 a \sqrt [4]{1-a x} (1+a x)^{3/4}}{12 x^2}-\frac {11 a^2 \sqrt [4]{1-a x} (1+a x)^{3/4}}{24 x}-\frac {3}{8} a^3 \tan ^{-1}\left (\frac {\sqrt [4]{1+a x}}{\sqrt [4]{1-a x}}\right )+\frac {3}{8} a^3 \tanh ^{-1}\left (\frac {\sqrt [4]{1+a x}}{\sqrt [4]{1-a x}}\right )\\ \end {align*}
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Mathematica [C] Result contains higher order function than in optimal. Order 5 vs. order 3 in
optimal.
time = 0.02, size = 78, normalized size = 0.56 \begin {gather*} \frac {\sqrt [4]{1-a x} \left (-8+2 a x-a^2 x^2-11 a^3 x^3+18 a^3 x^3 \, _2F_1\left (\frac {1}{4},1;\frac {5}{4};\frac {1-a x}{1+a x}\right )\right )}{24 x^3 \sqrt [4]{1+a x}} \end {gather*}
Antiderivative was successfully verified.
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Maple [F]
time = 0.01, size = 0, normalized size = 0.00 \[\int \frac {1}{\sqrt {\frac {a x +1}{\sqrt {-a^{2} x^{2}+1}}}\, x^{4}}\, dx\]
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {Failed to integrate} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A]
time = 0.38, size = 157, normalized size = 1.13 \begin {gather*} -\frac {18 \, a^{3} x^{3} \arctan \left (\sqrt {-\frac {\sqrt {-a^{2} x^{2} + 1}}{a x - 1}}\right ) - 9 \, a^{3} x^{3} \log \left (\sqrt {-\frac {\sqrt {-a^{2} x^{2} + 1}}{a x - 1}} + 1\right ) + 9 \, a^{3} x^{3} \log \left (\sqrt {-\frac {\sqrt {-a^{2} x^{2} + 1}}{a x - 1}} - 1\right ) + 2 \, {\left (11 \, a^{2} x^{2} - 10 \, a x + 8\right )} \sqrt {-a^{2} x^{2} + 1} \sqrt {-\frac {\sqrt {-a^{2} x^{2} + 1}}{a x - 1}}}{48 \, x^{3}} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \int \frac {1}{x^{4} \sqrt {\frac {a x + 1}{\sqrt {- a^{2} x^{2} + 1}}}}\, dx \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \text {could not integrate} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [F]
time = 0.00, size = -1, normalized size = -0.01 \begin {gather*} \int \frac {1}{x^4\,\sqrt {\frac {a\,x+1}{\sqrt {1-a^2\,x^2}}}} \,d x \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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