Optimal. Leaf size=30 \[ \frac{\tanh ^{-1}\left (\frac{\sqrt{b} 2^x}{\sqrt{a}}\right )}{\sqrt{a} \sqrt{b} \log (2)} \]
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Rubi [A] time = 0.028477, antiderivative size = 30, normalized size of antiderivative = 1., number of steps used = 2, number of rules used = 2, integrand size = 14, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.143, Rules used = {2249, 208} \[ \frac{\tanh ^{-1}\left (\frac{\sqrt{b} 2^x}{\sqrt{a}}\right )}{\sqrt{a} \sqrt{b} \log (2)} \]
Antiderivative was successfully verified.
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Rule 2249
Rule 208
Rubi steps
\begin{align*} \int \frac{2^x}{a-4^x b} \, dx &=\frac{\operatorname{Subst}\left (\int \frac{1}{a-b x^2} \, dx,x,2^x\right )}{\log (2)}\\ &=\frac{\tanh ^{-1}\left (\frac{2^x \sqrt{b}}{\sqrt{a}}\right )}{\sqrt{a} \sqrt{b} \log (2)}\\ \end{align*}
Mathematica [A] time = 0.0070214, size = 30, normalized size = 1. \[ \frac{\tanh ^{-1}\left (\frac{\sqrt{b} 2^x}{\sqrt{a}}\right )}{\sqrt{a} \sqrt{b} \log (2)} \]
Antiderivative was successfully verified.
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Maple [B] time = 0.026, size = 49, normalized size = 1.6 \begin{align*}{\frac{1}{2\,\ln \left ( 2 \right ) }\ln \left ({2}^{x}+{a{\frac{1}{\sqrt{ab}}}} \right ){\frac{1}{\sqrt{ab}}}}-{\frac{1}{2\,\ln \left ( 2 \right ) }\ln \left ({2}^{x}-{a{\frac{1}{\sqrt{ab}}}} \right ){\frac{1}{\sqrt{ab}}}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [F(-2)] time = 0., size = 0, normalized size = 0. \begin{align*} \text{Exception raised: ValueError} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [A] time = 1.5538, size = 189, normalized size = 6.3 \begin{align*} \left [\frac{\sqrt{a b} \log \left (\frac{2^{2 \, x} b + 2 \, \sqrt{a b} 2^{x} + a}{2^{2 \, x} b - a}\right )}{2 \, a b \log \left (2\right )}, -\frac{\sqrt{-a b} \arctan \left (\frac{\sqrt{-a b}}{2^{x} b}\right )}{a b \log \left (2\right )}\right ] \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [A] time = 0.340263, size = 29, normalized size = 0.97 \begin{align*} \frac{\operatorname{RootSum}{\left (4 z^{2} a b - 1, \left ( i \mapsto i \log{\left (2 i a + e^{\frac{x \log{\left (4 \right )}}{2}} \right )} \right )\right )}}{\log{\left (2 \right )}} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [F] time = 0., size = 0, normalized size = 0. \begin{align*} \int -\frac{2^{x}}{4^{x} b - a}\,{d x} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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