Optimal. Leaf size=52 \[ \frac{\sqrt{a+b} \tan ^{-1}\left (\frac{\sqrt{a-b} \tan (x)}{\sqrt{a+b}}\right )}{2 b \sqrt{a-b}}-\frac{x}{2 b} \]
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Rubi [A] time = 0.124984, antiderivative size = 52, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 2, integrand size = 15, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.133, Rules used = {1130, 205} \[ \frac{\sqrt{a+b} \tan ^{-1}\left (\frac{\sqrt{a-b} \tan (x)}{\sqrt{a+b}}\right )}{2 b \sqrt{a-b}}-\frac{x}{2 b} \]
Antiderivative was successfully verified.
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Rule 1130
Rule 205
Rubi steps
\begin{align*} \int \frac{\sin ^2(x)}{a+b \cos (2 x)} \, dx &=\operatorname{Subst}\left (\int \frac{x^2}{a+b+2 a x^2+(a-b) x^4} \, dx,x,\tan (x)\right )\\ &=-\left (\frac{1}{2} \left (-1+\frac{a}{b}\right ) \operatorname{Subst}\left (\int \frac{1}{a-b+(a-b) x^2} \, dx,x,\tan (x)\right )\right )+\frac{(a+b) \operatorname{Subst}\left (\int \frac{1}{a+b+(a-b) x^2} \, dx,x,\tan (x)\right )}{2 b}\\ &=-\frac{x}{2 b}+\frac{\sqrt{a+b} \tan ^{-1}\left (\frac{\sqrt{a-b} \tan (x)}{\sqrt{a+b}}\right )}{2 \sqrt{a-b} b}\\ \end{align*}
Mathematica [A] time = 0.0895307, size = 48, normalized size = 0.92 \[ -\frac{\frac{(a+b) \tanh ^{-1}\left (\frac{(a-b) \tan (x)}{\sqrt{b^2-a^2}}\right )}{\sqrt{b^2-a^2}}+x}{2 b} \]
Antiderivative was successfully verified.
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Maple [A] time = 0.045, size = 80, normalized size = 1.5 \begin{align*} -{\frac{\arctan \left ( \tan \left ( x \right ) \right ) }{2\,b}}+{\frac{a}{2\,b}\arctan \left ({\tan \left ( x \right ) \left ( a-b \right ){\frac{1}{\sqrt{ \left ( a-b \right ) \left ( a+b \right ) }}}} \right ){\frac{1}{\sqrt{ \left ( a-b \right ) \left ( a+b \right ) }}}}+{\frac{1}{2}\arctan \left ({\tan \left ( x \right ) \left ( a-b \right ){\frac{1}{\sqrt{ \left ( a-b \right ) \left ( a+b \right ) }}}} \right ){\frac{1}{\sqrt{ \left ( a-b \right ) \left ( a+b \right ) }}}} \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 = 2.30778, size = 535, normalized size = 10.29 \begin{align*} \left [\frac{\sqrt{-\frac{a + b}{a - b}} \log \left (\frac{4 \,{\left (2 \, a^{2} - b^{2}\right )} \cos \left (x\right )^{4} - 4 \,{\left (2 \, a^{2} - a b - b^{2}\right )} \cos \left (x\right )^{2} - 4 \,{\left (2 \,{\left (a^{2} - a b\right )} \cos \left (x\right )^{3} -{\left (a^{2} - 2 \, a b + b^{2}\right )} \cos \left (x\right )\right )} \sqrt{-\frac{a + b}{a - b}} \sin \left (x\right ) + a^{2} - 2 \, a b + b^{2}}{4 \, b^{2} \cos \left (x\right )^{4} + 4 \,{\left (a b - b^{2}\right )} \cos \left (x\right )^{2} + a^{2} - 2 \, a b + b^{2}}\right ) - 4 \, x}{8 \, b}, -\frac{\sqrt{\frac{a + b}{a - b}} \arctan \left (\frac{{\left (2 \, a \cos \left (x\right )^{2} - a + b\right )} \sqrt{\frac{a + b}{a - b}}}{2 \,{\left (a + b\right )} \cos \left (x\right ) \sin \left (x\right )}\right ) + 2 \, x}{4 \, b}\right ] \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [B] time = 63.917, size = 432, normalized size = 8.31 \begin{align*} \frac{\begin{cases} \tilde{\infty } \left (- \frac{\log{\left (\tan{\left (x \right )} - 1 \right )}}{2} + \frac{\log{\left (\tan{\left (x \right )} + 1 \right )}}{2}\right ) & \text{for}\: a = 0 \wedge b = 0 \\\frac{\tan{\left (x \right )}}{2 b} & \text{for}\: a = b \\\frac{1}{2 b \tan{\left (x \right )}} & \text{for}\: a = - b \\\frac{\log{\left (- \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}} + \tan{\left (x \right )} \right )}}{2 a \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}} - 2 b \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}}} - \frac{\log{\left (\sqrt{- \frac{a}{a - b} - \frac{b}{a - b}} + \tan{\left (x \right )} \right )}}{2 a \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}} - 2 b \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}}} & \text{otherwise} \end{cases}}{2} - \frac{\begin{cases} \tilde{\infty } x & \text{for}\: a = 0 \wedge b = 0 \\\frac{x}{b} - \frac{\tan{\left (x \right )}}{2 b} & \text{for}\: a = b \\\frac{x}{b} + \frac{1}{2 b \tan{\left (x \right )}} & \text{for}\: a = - b \\\frac{\sin{\left (2 x \right )}}{2 a} & \text{for}\: b = 0 \\\frac{2 a x \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}}}{2 a b \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}} - 2 b^{2} \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}}} - \frac{a \log{\left (- \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}} + \tan{\left (x \right )} \right )}}{2 a b \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}} - 2 b^{2} \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}}} + \frac{a \log{\left (\sqrt{- \frac{a}{a - b} - \frac{b}{a - b}} + \tan{\left (x \right )} \right )}}{2 a b \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}} - 2 b^{2} \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}}} - \frac{2 b x \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}}}{2 a b \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}} - 2 b^{2} \sqrt{- \frac{a}{a - b} - \frac{b}{a - b}}} & \text{otherwise} \end{cases}}{2} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A] time = 1.08859, size = 93, normalized size = 1.79 \begin{align*} -\frac{{\left (\pi \left \lfloor \frac{x}{\pi } + \frac{1}{2} \right \rfloor \mathrm{sgn}\left (-2 \, a + 2 \, b\right ) + \arctan \left (-\frac{a \tan \left (x\right ) - b \tan \left (x\right )}{\sqrt{a^{2} - b^{2}}}\right )\right )}{\left (a + b\right )}}{2 \, \sqrt{a^{2} - b^{2}} b} - \frac{x}{2 \, b} \end{align*}
Verification of antiderivative is not currently implemented for this CAS.
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