Optimal. Leaf size=48 \[ \frac{\log \left (a+b x+c x^2\right )}{d \left (b^2-4 a c\right )}-\frac{2 \log (b+2 c x)}{d \left (b^2-4 a c\right )} \]
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Rubi [A] time = 0.0233232, antiderivative size = 48, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 3, integrand size = 24, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.125, Rules used = {681, 31, 628} \[ \frac{\log \left (a+b x+c x^2\right )}{d \left (b^2-4 a c\right )}-\frac{2 \log (b+2 c x)}{d \left (b^2-4 a c\right )} \]
Antiderivative was successfully verified.
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Rule 681
Rule 31
Rule 628
Rubi steps
\begin{align*} \int \frac{1}{(b d+2 c d x) \left (a+b x+c x^2\right )} \, dx &=\frac{\int \frac{b d+2 c d x}{a+b x+c x^2} \, dx}{\left (b^2-4 a c\right ) d^2}-\frac{(4 c) \int \frac{1}{b+2 c x} \, dx}{\left (b^2-4 a c\right ) d}\\ &=-\frac{2 \log (b+2 c x)}{\left (b^2-4 a c\right ) d}+\frac{\log \left (a+b x+c x^2\right )}{\left (b^2-4 a c\right ) d}\\ \end{align*}
Mathematica [A] time = 0.0203116, size = 34, normalized size = 0.71 \[ \frac{\log (a+x (b+c x))-2 \log (b+2 c x)}{d \left (b^2-4 a c\right )} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.044, size = 54, normalized size = 1.1 \begin{align*} -{\frac{\ln \left ( c{x}^{2}+bx+a \right ) }{d \left ( 4\,ac-{b}^{2} \right ) }}+2\,{\frac{\ln \left ( 2\,cx+b \right ) }{d \left ( 4\,ac-{b}^{2} \right ) }} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [A] time = 1.20289, size = 65, normalized size = 1.35 \begin{align*} \frac{\log \left (c x^{2} + b x + a\right )}{{\left (b^{2} - 4 \, a c\right )} d} - \frac{2 \, \log \left (2 \, c x + b\right )}{{\left (b^{2} - 4 \, a c\right )} d} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.64533, size = 82, normalized size = 1.71 \begin{align*} \frac{\log \left (c x^{2} + b x + a\right ) - 2 \, \log \left (2 \, c x + b\right )}{{\left (b^{2} - 4 \, a c\right )} d} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.92411, size = 42, normalized size = 0.88 \begin{align*} \frac{2 \log{\left (\frac{b}{2 c} + x \right )}}{d \left (4 a c - b^{2}\right )} - \frac{\log{\left (\frac{a}{c} + \frac{b x}{c} + x^{2} \right )}}{d \left (4 a c - b^{2}\right )} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.19323, size = 77, normalized size = 1.6 \begin{align*} -\frac{2 \, c^{2} \log \left ({\left | 2 \, c x + b \right |}\right )}{b^{2} c^{2} d - 4 \, a c^{3} d} + \frac{\log \left (c x^{2} + b x + a\right )}{b^{2} d - 4 \, a c d} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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