Optimal. Leaf size=45 \[ \frac{\tan ^{-1}\left (\frac{\sqrt{b} x}{\sqrt{a}}\right )}{2 \sqrt{a} b^{3/2}}-\frac{x}{2 b \left (a+b x^2\right )} \]
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Rubi [A] time = 0.0124618, antiderivative size = 45, normalized size of antiderivative = 1., number of steps used = 2, number of rules used = 2, integrand size = 13, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.154, Rules used = {288, 205} \[ \frac{\tan ^{-1}\left (\frac{\sqrt{b} x}{\sqrt{a}}\right )}{2 \sqrt{a} b^{3/2}}-\frac{x}{2 b \left (a+b x^2\right )} \]
Antiderivative was successfully verified.
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Rule 288
Rule 205
Rubi steps
\begin{align*} \int \frac{x^2}{\left (a+b x^2\right )^2} \, dx &=-\frac{x}{2 b \left (a+b x^2\right )}+\frac{\int \frac{1}{a+b x^2} \, dx}{2 b}\\ &=-\frac{x}{2 b \left (a+b x^2\right )}+\frac{\tan ^{-1}\left (\frac{\sqrt{b} x}{\sqrt{a}}\right )}{2 \sqrt{a} b^{3/2}}\\ \end{align*}
Mathematica [A] time = 0.019776, size = 45, normalized size = 1. \[ \frac{\tan ^{-1}\left (\frac{\sqrt{b} x}{\sqrt{a}}\right )}{2 \sqrt{a} b^{3/2}}-\frac{x}{2 b \left (a+b x^2\right )} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.007, size = 36, normalized size = 0.8 \begin{align*} -{\frac{x}{2\,b \left ( b{x}^{2}+a \right ) }}+{\frac{1}{2\,b}\arctan \left ({bx{\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 = 1.21179, size = 263, normalized size = 5.84 \begin{align*} \left [-\frac{2 \, a b x +{\left (b x^{2} + a\right )} \sqrt{-a b} \log \left (\frac{b x^{2} - 2 \, \sqrt{-a b} x - a}{b x^{2} + a}\right )}{4 \,{\left (a b^{3} x^{2} + a^{2} b^{2}\right )}}, -\frac{a b x -{\left (b x^{2} + a\right )} \sqrt{a b} \arctan \left (\frac{\sqrt{a b} x}{a}\right )}{2 \,{\left (a b^{3} x^{2} + a^{2} b^{2}\right )}}\right ] \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [B] time = 0.341995, size = 78, normalized size = 1.73 \begin{align*} - \frac{x}{2 a b + 2 b^{2} x^{2}} - \frac{\sqrt{- \frac{1}{a b^{3}}} \log{\left (- a b \sqrt{- \frac{1}{a b^{3}}} + x \right )}}{4} + \frac{\sqrt{- \frac{1}{a b^{3}}} \log{\left (a b \sqrt{- \frac{1}{a b^{3}}} + x \right )}}{4} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 3.15065, size = 47, normalized size = 1.04 \begin{align*} \frac{\arctan \left (\frac{b x}{\sqrt{a b}}\right )}{2 \, \sqrt{a b} b} - \frac{x}{2 \,{\left (b x^{2} + a\right )} b} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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