Integrand size = 10, antiderivative size = 24 \[ \int \frac {1}{x^3 \log ^2(c x)} \, dx=-2 c^2 \operatorname {ExpIntegralEi}(-2 \log (c x))-\frac {1}{x^2 \log (c x)} \]
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Time = 0.02 (sec) , antiderivative size = 24, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.300, Rules used = {2343, 2346, 2209} \[ \int \frac {1}{x^3 \log ^2(c x)} \, dx=-2 c^2 \operatorname {ExpIntegralEi}(-2 \log (c x))-\frac {1}{x^2 \log (c x)} \]
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Rule 2209
Rule 2343
Rule 2346
Rubi steps \begin{align*} \text {integral}& = -\frac {1}{x^2 \log (c x)}-2 \int \frac {1}{x^3 \log (c x)} \, dx \\ & = -\frac {1}{x^2 \log (c x)}-\left (2 c^2\right ) \text {Subst}\left (\int \frac {e^{-2 x}}{x} \, dx,x,\log (c x)\right ) \\ & = -2 c^2 \text {Ei}(-2 \log (c x))-\frac {1}{x^2 \log (c x)} \\ \end{align*}
Time = 0.02 (sec) , antiderivative size = 24, normalized size of antiderivative = 1.00 \[ \int \frac {1}{x^3 \log ^2(c x)} \, dx=-2 c^2 \operatorname {ExpIntegralEi}(-2 \log (c x))-\frac {1}{x^2 \log (c x)} \]
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Time = 0.03 (sec) , antiderivative size = 26, normalized size of antiderivative = 1.08
method | result | size |
risch | \(-\frac {1}{x^{2} \ln \left (x c \right )}+2 c^{2} \operatorname {Ei}_{1}\left (2 \ln \left (x c \right )\right )\) | \(26\) |
derivativedivides | \(c^{2} \left (-\frac {1}{x^{2} c^{2} \ln \left (x c \right )}+2 \,\operatorname {Ei}_{1}\left (2 \ln \left (x c \right )\right )\right )\) | \(30\) |
default | \(c^{2} \left (-\frac {1}{x^{2} c^{2} \ln \left (x c \right )}+2 \,\operatorname {Ei}_{1}\left (2 \ln \left (x c \right )\right )\right )\) | \(30\) |
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Time = 0.33 (sec) , antiderivative size = 33, normalized size of antiderivative = 1.38 \[ \int \frac {1}{x^3 \log ^2(c x)} \, dx=-\frac {2 \, c^{2} x^{2} \log \left (c x\right ) \operatorname {log\_integral}\left (\frac {1}{c^{2} x^{2}}\right ) + 1}{x^{2} \log \left (c x\right )} \]
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\[ \int \frac {1}{x^3 \log ^2(c x)} \, dx=- 2 \int \frac {1}{x^{3} \log {\left (c x \right )}}\, dx - \frac {1}{x^{2} \log {\left (c x \right )}} \]
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Time = 0.24 (sec) , antiderivative size = 13, normalized size of antiderivative = 0.54 \[ \int \frac {1}{x^3 \log ^2(c x)} \, dx=-2 \, c^{2} \Gamma \left (-1, 2 \, \log \left (c x\right )\right ) \]
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\[ \int \frac {1}{x^3 \log ^2(c x)} \, dx=\int { \frac {1}{x^{3} \log \left (c x\right )^{2}} \,d x } \]
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Timed out. \[ \int \frac {1}{x^3 \log ^2(c x)} \, dx=\int \frac {1}{x^3\,{\ln \left (c\,x\right )}^2} \,d x \]
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