Integrand size = 14, antiderivative size = 47 \[ \int \frac {\cot ^{-1}(a+b x)}{(a+b x)^2} \, dx=-\frac {\cot ^{-1}(a+b x)}{b (a+b x)}-\frac {\log (a+b x)}{b}+\frac {\log \left (1+(a+b x)^2\right )}{2 b} \]
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Time = 0.02 (sec) , antiderivative size = 47, normalized size of antiderivative = 1.00, number of steps used = 6, number of rules used = 6, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.429, Rules used = {5152, 4947, 272, 36, 29, 31} \[ \int \frac {\cot ^{-1}(a+b x)}{(a+b x)^2} \, dx=-\frac {\log (a+b x)}{b}+\frac {\log \left ((a+b x)^2+1\right )}{2 b}-\frac {\cot ^{-1}(a+b x)}{b (a+b x)} \]
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Rule 29
Rule 31
Rule 36
Rule 272
Rule 4947
Rule 5152
Rubi steps \begin{align*} \text {integral}& = \frac {\text {Subst}\left (\int \frac {\cot ^{-1}(x)}{x^2} \, dx,x,a+b x\right )}{b} \\ & = -\frac {\cot ^{-1}(a+b x)}{b (a+b x)}-\frac {\text {Subst}\left (\int \frac {1}{x \left (1+x^2\right )} \, dx,x,a+b x\right )}{b} \\ & = -\frac {\cot ^{-1}(a+b x)}{b (a+b x)}-\frac {\text {Subst}\left (\int \frac {1}{x (1+x)} \, dx,x,(a+b x)^2\right )}{2 b} \\ & = -\frac {\cot ^{-1}(a+b x)}{b (a+b x)}-\frac {\text {Subst}\left (\int \frac {1}{x} \, dx,x,(a+b x)^2\right )}{2 b}+\frac {\text {Subst}\left (\int \frac {1}{1+x} \, dx,x,(a+b x)^2\right )}{2 b} \\ & = -\frac {\cot ^{-1}(a+b x)}{b (a+b x)}-\frac {\log (a+b x)}{b}+\frac {\log \left (1+(a+b x)^2\right )}{2 b} \\ \end{align*}
Time = 0.01 (sec) , antiderivative size = 42, normalized size of antiderivative = 0.89 \[ \int \frac {\cot ^{-1}(a+b x)}{(a+b x)^2} \, dx=\frac {-\frac {\cot ^{-1}(a+b x)}{a+b x}-\log (a+b x)+\frac {1}{2} \log \left (1+(a+b x)^2\right )}{b} \]
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Time = 0.47 (sec) , antiderivative size = 41, normalized size of antiderivative = 0.87
method | result | size |
derivativedivides | \(\frac {-\frac {\operatorname {arccot}\left (b x +a \right )}{b x +a}-\ln \left (b x +a \right )+\frac {\ln \left (1+\left (b x +a \right )^{2}\right )}{2}}{b}\) | \(41\) |
default | \(\frac {-\frac {\operatorname {arccot}\left (b x +a \right )}{b x +a}-\ln \left (b x +a \right )+\frac {\ln \left (1+\left (b x +a \right )^{2}\right )}{2}}{b}\) | \(41\) |
parts | \(-\frac {\operatorname {arccot}\left (b x +a \right )}{b \left (b x +a \right )}+\frac {\ln \left (b^{2} x^{2}+2 a b x +a^{2}+1\right )}{2 b}-\frac {\ln \left (b x +a \right )}{b}\) | \(54\) |
parallelrisch | \(-\frac {6 \ln \left (b x +a \right ) x a \,b^{2}-3 b^{2} \ln \left (b^{2} x^{2}+2 a b x +a^{2}+1\right ) a x +6 \ln \left (b x +a \right ) a^{2} b -3 \ln \left (b^{2} x^{2}+2 a b x +a^{2}+1\right ) a^{2} b +6 \,\operatorname {arccot}\left (b x +a \right ) a b}{6 \left (b x +a \right ) a \,b^{2}}\) | \(101\) |
risch | \(-\frac {i \ln \left (1+i \left (b x +a \right )\right )}{2 b \left (b x +a \right )}-\frac {2 \ln \left (-b x -a \right ) b x -\ln \left (b^{2} x^{2}+2 a b x +a^{2}+1\right ) b x +2 \ln \left (-b x -a \right ) a -a \ln \left (b^{2} x^{2}+2 a b x +a^{2}+1\right )-i \ln \left (1-i \left (b x +a \right )\right )+\pi }{2 \left (b x +a \right ) b}\) | \(122\) |
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Time = 0.27 (sec) , antiderivative size = 59, normalized size of antiderivative = 1.26 \[ \int \frac {\cot ^{-1}(a+b x)}{(a+b x)^2} \, dx=\frac {{\left (b x + a\right )} \log \left (b^{2} x^{2} + 2 \, a b x + a^{2} + 1\right ) - 2 \, {\left (b x + a\right )} \log \left (b x + a\right ) - 2 \, \operatorname {arccot}\left (b x + a\right )}{2 \, {\left (b^{2} x + a b\right )}} \]
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Result contains complex when optimal does not.
Time = 1.33 (sec) , antiderivative size = 139, normalized size of antiderivative = 2.96 \[ \int \frac {\cot ^{-1}(a+b x)}{(a+b x)^2} \, dx=\begin {cases} - \frac {a \log {\left (\frac {a}{b} + x \right )}}{a b + b^{2} x} + \frac {a \log {\left (\frac {a}{b} + x - \frac {i}{b} \right )}}{a b + b^{2} x} + \frac {i a \operatorname {acot}{\left (a + b x \right )}}{a b + b^{2} x} - \frac {b x \log {\left (\frac {a}{b} + x \right )}}{a b + b^{2} x} + \frac {b x \log {\left (\frac {a}{b} + x - \frac {i}{b} \right )}}{a b + b^{2} x} + \frac {i b x \operatorname {acot}{\left (a + b x \right )}}{a b + b^{2} x} - \frac {\operatorname {acot}{\left (a + b x \right )}}{a b + b^{2} x} & \text {for}\: b \neq 0 \\\frac {x \operatorname {acot}{\left (a \right )}}{a^{2}} & \text {otherwise} \end {cases} \]
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Time = 0.20 (sec) , antiderivative size = 53, normalized size of antiderivative = 1.13 \[ \int \frac {\cot ^{-1}(a+b x)}{(a+b x)^2} \, dx=\frac {\log \left (b^{2} x^{2} + 2 \, a b x + a^{2} + 1\right )}{2 \, b} - \frac {\log \left (b x + a\right )}{b} - \frac {\operatorname {arccot}\left (b x + a\right )}{{\left (b x + a\right )} b} \]
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Leaf count of result is larger than twice the leaf count of optimal. 238 vs. \(2 (45) = 90\).
Time = 0.33 (sec) , antiderivative size = 238, normalized size of antiderivative = 5.06 \[ \int \frac {\cot ^{-1}(a+b x)}{(a+b x)^2} \, dx=-\frac {\arctan \left (\frac {1}{b x + a}\right )^{2} - \frac {\arctan \left (\frac {1}{b x + a}\right )^{2} \tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{2} - \log \left (\frac {4 \, {\left (\tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{4} - 2 \, \tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{2} + 1\right )}}{\tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{4} + 2 \, \tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{2} + 1}\right ) \tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{2} - \arctan \left (\frac {1}{b x + a}\right )^{2} + 4 \, \arctan \left (\frac {1}{b x + a}\right ) \tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right ) + \log \left (\frac {4 \, {\left (\tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{4} - 2 \, \tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{2} + 1\right )}}{\tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{4} + 2 \, \tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{2} + 1}\right )}{\tan \left (\frac {1}{2} \, \arctan \left (\frac {1}{b x + a}\right )\right )^{2} - 1}}{2 \, b} \]
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Time = 0.93 (sec) , antiderivative size = 57, normalized size of antiderivative = 1.21 \[ \int \frac {\cot ^{-1}(a+b x)}{(a+b x)^2} \, dx=\frac {\ln \left (-a^2-2\,a\,b\,x-b^2\,x^2-1\right )}{2\,b}-\frac {\ln \left (a+b\,x\right )}{b}-\frac {\mathrm {acot}\left (a+b\,x\right )}{x\,b^2+a\,b} \]
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