Integrand size = 14, antiderivative size = 51 \[ \int x^3 \cosh ^2\left (a+b x^2\right ) \, dx=\frac {x^4}{8}-\frac {\cosh ^2\left (a+b x^2\right )}{8 b^2}+\frac {x^2 \cosh \left (a+b x^2\right ) \sinh \left (a+b x^2\right )}{4 b} \]
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Time = 0.04 (sec) , antiderivative size = 51, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.214, Rules used = {5429, 3391, 30} \[ \int x^3 \cosh ^2\left (a+b x^2\right ) \, dx=-\frac {\cosh ^2\left (a+b x^2\right )}{8 b^2}+\frac {x^2 \sinh \left (a+b x^2\right ) \cosh \left (a+b x^2\right )}{4 b}+\frac {x^4}{8} \]
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Rule 30
Rule 3391
Rule 5429
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} \text {Subst}\left (\int x \cosh ^2(a+b x) \, dx,x,x^2\right ) \\ & = -\frac {\cosh ^2\left (a+b x^2\right )}{8 b^2}+\frac {x^2 \cosh \left (a+b x^2\right ) \sinh \left (a+b x^2\right )}{4 b}+\frac {1}{4} \text {Subst}\left (\int x \, dx,x,x^2\right ) \\ & = \frac {x^4}{8}-\frac {\cosh ^2\left (a+b x^2\right )}{8 b^2}+\frac {x^2 \cosh \left (a+b x^2\right ) \sinh \left (a+b x^2\right )}{4 b} \\ \end{align*}
Time = 0.08 (sec) , antiderivative size = 40, normalized size of antiderivative = 0.78 \[ \int x^3 \cosh ^2\left (a+b x^2\right ) \, dx=-\frac {\cosh \left (2 \left (a+b x^2\right )\right )-2 b x^2 \left (b x^2+\sinh \left (2 \left (a+b x^2\right )\right )\right )}{16 b^2} \]
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Time = 0.15 (sec) , antiderivative size = 46, normalized size of antiderivative = 0.90
method | result | size |
parallelrisch | \(\frac {2 b^{2} x^{4}+2 b \,x^{2} \sinh \left (2 b \,x^{2}+2 a \right )-\cosh \left (2 b \,x^{2}+2 a \right )+1}{16 b^{2}}\) | \(46\) |
risch | \(\frac {x^{4}}{8}+\frac {\left (2 b \,x^{2}-1\right ) {\mathrm e}^{2 b \,x^{2}+2 a}}{32 b^{2}}-\frac {\left (2 b \,x^{2}+1\right ) {\mathrm e}^{-2 b \,x^{2}-2 a}}{32 b^{2}}\) | \(55\) |
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none
Time = 0.25 (sec) , antiderivative size = 60, normalized size of antiderivative = 1.18 \[ \int x^3 \cosh ^2\left (a+b x^2\right ) \, dx=\frac {2 \, b^{2} x^{4} + 4 \, b x^{2} \cosh \left (b x^{2} + a\right ) \sinh \left (b x^{2} + a\right ) - \cosh \left (b x^{2} + a\right )^{2} - \sinh \left (b x^{2} + a\right )^{2}}{16 \, b^{2}} \]
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Time = 0.29 (sec) , antiderivative size = 78, normalized size of antiderivative = 1.53 \[ \int x^3 \cosh ^2\left (a+b x^2\right ) \, dx=\begin {cases} - \frac {x^{4} \sinh ^{2}{\left (a + b x^{2} \right )}}{8} + \frac {x^{4} \cosh ^{2}{\left (a + b x^{2} \right )}}{8} + \frac {x^{2} \sinh {\left (a + b x^{2} \right )} \cosh {\left (a + b x^{2} \right )}}{4 b} - \frac {\cosh ^{2}{\left (a + b x^{2} \right )}}{8 b^{2}} & \text {for}\: b \neq 0 \\\frac {x^{4} \cosh ^{2}{\left (a \right )}}{4} & \text {otherwise} \end {cases} \]
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Time = 0.20 (sec) , antiderivative size = 59, normalized size of antiderivative = 1.16 \[ \int x^3 \cosh ^2\left (a+b x^2\right ) \, dx=\frac {1}{8} \, x^{4} + \frac {{\left (2 \, b x^{2} e^{\left (2 \, a\right )} - e^{\left (2 \, a\right )}\right )} e^{\left (2 \, b x^{2}\right )}}{32 \, b^{2}} - \frac {{\left (2 \, b x^{2} + 1\right )} e^{\left (-2 \, b x^{2} - 2 \, a\right )}}{32 \, b^{2}} \]
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Leaf count of result is larger than twice the leaf count of optimal. 142 vs. \(2 (45) = 90\).
Time = 0.26 (sec) , antiderivative size = 142, normalized size of antiderivative = 2.78 \[ \int x^3 \cosh ^2\left (a+b x^2\right ) \, dx=\frac {4 \, {\left (b x^{2} + a\right )}^{2} + 2 \, {\left (b x^{2} + a\right )} e^{\left (2 \, b x^{2} + 2 \, a\right )} - 2 \, {\left (b x^{2} + a\right )} e^{\left (-2 \, b x^{2} - 2 \, a\right )} - e^{\left (2 \, b x^{2} + 2 \, a\right )} - e^{\left (-2 \, b x^{2} - 2 \, a\right )}}{32 \, b^{2}} - \frac {4 \, {\left (b x^{2} + a\right )} a + a e^{\left (2 \, b x^{2} + 2 \, a\right )} - {\left (2 \, a e^{\left (2 \, b x^{2} + 2 \, a\right )} + a\right )} e^{\left (-2 \, b x^{2} - 2 \, a\right )}}{16 \, b^{2}} \]
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Time = 0.11 (sec) , antiderivative size = 42, normalized size of antiderivative = 0.82 \[ \int x^3 \cosh ^2\left (a+b x^2\right ) \, dx=\frac {x^4}{8}-\frac {\frac {\mathrm {cosh}\left (2\,b\,x^2+2\,a\right )}{16}-\frac {b\,x^2\,\mathrm {sinh}\left (2\,b\,x^2+2\,a\right )}{8}}{b^2} \]
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