Integrand size = 19, antiderivative size = 143 \[ \int (a+b x)^{-4+n} (c+d x)^{-n} \, dx=-\frac {(a+b x)^{-3+n} (c+d x)^{1-n}}{(b c-a d) (3-n)}+\frac {2 d (a+b x)^{-2+n} (c+d x)^{1-n}}{(b c-a d)^2 (2-n) (3-n)}-\frac {2 d^2 (a+b x)^{-1+n} (c+d x)^{1-n}}{(b c-a d)^3 (1-n) (2-n) (3-n)} \]
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Time = 0.05 (sec) , antiderivative size = 143, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.105, Rules used = {47, 37} \[ \int (a+b x)^{-4+n} (c+d x)^{-n} \, dx=-\frac {2 d^2 (a+b x)^{n-1} (c+d x)^{1-n}}{(1-n) (2-n) (3-n) (b c-a d)^3}-\frac {(a+b x)^{n-3} (c+d x)^{1-n}}{(3-n) (b c-a d)}+\frac {2 d (a+b x)^{n-2} (c+d x)^{1-n}}{(2-n) (3-n) (b c-a d)^2} \]
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Rule 37
Rule 47
Rubi steps \begin{align*} \text {integral}& = -\frac {(a+b x)^{-3+n} (c+d x)^{1-n}}{(b c-a d) (3-n)}-\frac {(2 d) \int (a+b x)^{-3+n} (c+d x)^{-n} \, dx}{(b c-a d) (3-n)} \\ & = -\frac {(a+b x)^{-3+n} (c+d x)^{1-n}}{(b c-a d) (3-n)}+\frac {2 d (a+b x)^{-2+n} (c+d x)^{1-n}}{(b c-a d)^2 (2-n) (3-n)}+\frac {\left (2 d^2\right ) \int (a+b x)^{-2+n} (c+d x)^{-n} \, dx}{(b c-a d)^2 (2-n) (3-n)} \\ & = -\frac {(a+b x)^{-3+n} (c+d x)^{1-n}}{(b c-a d) (3-n)}+\frac {2 d (a+b x)^{-2+n} (c+d x)^{1-n}}{(b c-a d)^2 (2-n) (3-n)}-\frac {2 d^2 (a+b x)^{-1+n} (c+d x)^{1-n}}{(b c-a d)^3 (1-n) (2-n) (3-n)} \\ \end{align*}
Time = 0.08 (sec) , antiderivative size = 112, normalized size of antiderivative = 0.78 \[ \int (a+b x)^{-4+n} (c+d x)^{-n} \, dx=\frac {(a+b x)^{-3+n} (c+d x)^{1-n} \left (a^2 d^2 \left (6-5 n+n^2\right )-2 a b d (-3+n) (c (-1+n)+d x)+b^2 \left (c^2 \left (2-3 n+n^2\right )+2 c d (-1+n) x+2 d^2 x^2\right )\right )}{(b c-a d)^3 (-3+n) (-2+n) (-1+n)} \]
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Leaf count of result is larger than twice the leaf count of optimal. \(321\) vs. \(2(143)=286\).
Time = 0.54 (sec) , antiderivative size = 322, normalized size of antiderivative = 2.25
method | result | size |
gosper | \(-\frac {\left (b x +a \right )^{-3+n} \left (d x +c \right ) \left (d x +c \right )^{-n} \left (a^{2} d^{2} n^{2}-2 a b c d \,n^{2}-2 a b \,d^{2} n x +b^{2} c^{2} n^{2}+2 b^{2} c d n x +2 d^{2} x^{2} b^{2}-5 a^{2} d^{2} n +8 a b c d n +6 x a b \,d^{2}-3 b^{2} c^{2} n -2 x \,b^{2} c d +6 a^{2} d^{2}-6 a b c d +2 b^{2} c^{2}\right )}{a^{3} d^{3} n^{3}-3 a^{2} b c \,d^{2} n^{3}+3 a \,b^{2} c^{2} d \,n^{3}-b^{3} c^{3} n^{3}-6 a^{3} d^{3} n^{2}+18 a^{2} b c \,d^{2} n^{2}-18 a \,b^{2} c^{2} d \,n^{2}+6 b^{3} c^{3} n^{2}+11 a^{3} d^{3} n -33 a^{2} b c \,d^{2} n +33 a \,b^{2} c^{2} d n -11 b^{3} c^{3} n -6 a^{3} d^{3}+18 a^{2} b c \,d^{2}-18 a \,b^{2} c^{2} d +6 b^{3} c^{3}}\) | \(322\) |
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Leaf count of result is larger than twice the leaf count of optimal. 512 vs. \(2 (130) = 260\).
Time = 0.24 (sec) , antiderivative size = 512, normalized size of antiderivative = 3.58 \[ \int (a+b x)^{-4+n} (c+d x)^{-n} \, dx=-\frac {{\left (2 \, b^{3} d^{3} x^{4} + 2 \, a b^{2} c^{3} - 6 \, a^{2} b c^{2} d + 6 \, a^{3} c d^{2} + 2 \, {\left (4 \, a b^{2} d^{3} + {\left (b^{3} c d^{2} - a b^{2} d^{3}\right )} n\right )} x^{3} + {\left (a b^{2} c^{3} - 2 \, a^{2} b c^{2} d + a^{3} c d^{2}\right )} n^{2} + {\left (12 \, a^{2} b d^{3} + {\left (b^{3} c^{2} d - 2 \, a b^{2} c d^{2} + a^{2} b d^{3}\right )} n^{2} - {\left (b^{3} c^{2} d - 8 \, a b^{2} c d^{2} + 7 \, a^{2} b d^{3}\right )} n\right )} x^{2} - {\left (3 \, a b^{2} c^{3} - 8 \, a^{2} b c^{2} d + 5 \, a^{3} c d^{2}\right )} n + {\left (2 \, b^{3} c^{3} - 6 \, a b^{2} c^{2} d + 6 \, a^{2} b c d^{2} + 6 \, a^{3} d^{3} + {\left (b^{3} c^{3} - a b^{2} c^{2} d - a^{2} b c d^{2} + a^{3} d^{3}\right )} n^{2} - {\left (3 \, b^{3} c^{3} - 7 \, a b^{2} c^{2} d - a^{2} b c d^{2} + 5 \, a^{3} d^{3}\right )} n\right )} x\right )} {\left (b x + a\right )}^{n - 4}}{{\left (6 \, b^{3} c^{3} - 18 \, a b^{2} c^{2} d + 18 \, a^{2} b c d^{2} - 6 \, a^{3} d^{3} - {\left (b^{3} c^{3} - 3 \, a b^{2} c^{2} d + 3 \, a^{2} b c d^{2} - a^{3} d^{3}\right )} n^{3} + 6 \, {\left (b^{3} c^{3} - 3 \, a b^{2} c^{2} d + 3 \, a^{2} b c d^{2} - a^{3} d^{3}\right )} n^{2} - 11 \, {\left (b^{3} c^{3} - 3 \, a b^{2} c^{2} d + 3 \, a^{2} b c d^{2} - a^{3} d^{3}\right )} n\right )} {\left (d x + c\right )}^{n}} \]
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Exception generated. \[ \int (a+b x)^{-4+n} (c+d x)^{-n} \, dx=\text {Exception raised: HeuristicGCDFailed} \]
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\[ \int (a+b x)^{-4+n} (c+d x)^{-n} \, dx=\int { \frac {{\left (b x + a\right )}^{n - 4}}{{\left (d x + c\right )}^{n}} \,d x } \]
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\[ \int (a+b x)^{-4+n} (c+d x)^{-n} \, dx=\int { \frac {{\left (b x + a\right )}^{n - 4}}{{\left (d x + c\right )}^{n}} \,d x } \]
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Time = 1.22 (sec) , antiderivative size = 528, normalized size of antiderivative = 3.69 \[ \int (a+b x)^{-4+n} (c+d x)^{-n} \, dx=-\frac {x\,{\left (a+b\,x\right )}^{n-4}\,\left (a^3\,d^3\,n^2-5\,a^3\,d^3\,n+6\,a^3\,d^3-a^2\,b\,c\,d^2\,n^2+a^2\,b\,c\,d^2\,n+6\,a^2\,b\,c\,d^2-a\,b^2\,c^2\,d\,n^2+7\,a\,b^2\,c^2\,d\,n-6\,a\,b^2\,c^2\,d+b^3\,c^3\,n^2-3\,b^3\,c^3\,n+2\,b^3\,c^3\right )}{{\left (a\,d-b\,c\right )}^3\,{\left (c+d\,x\right )}^n\,\left (n^3-6\,n^2+11\,n-6\right )}-\frac {a\,c\,{\left (a+b\,x\right )}^{n-4}\,\left (a^2\,d^2\,n^2-5\,a^2\,d^2\,n+6\,a^2\,d^2-2\,a\,b\,c\,d\,n^2+8\,a\,b\,c\,d\,n-6\,a\,b\,c\,d+b^2\,c^2\,n^2-3\,b^2\,c^2\,n+2\,b^2\,c^2\right )}{{\left (a\,d-b\,c\right )}^3\,{\left (c+d\,x\right )}^n\,\left (n^3-6\,n^2+11\,n-6\right )}-\frac {2\,b^3\,d^3\,x^4\,{\left (a+b\,x\right )}^{n-4}}{{\left (a\,d-b\,c\right )}^3\,{\left (c+d\,x\right )}^n\,\left (n^3-6\,n^2+11\,n-6\right )}-\frac {b\,d\,x^2\,{\left (a+b\,x\right )}^{n-4}\,\left (a^2\,d^2\,n^2-7\,a^2\,d^2\,n+12\,a^2\,d^2-2\,a\,b\,c\,d\,n^2+8\,a\,b\,c\,d\,n+b^2\,c^2\,n^2-b^2\,c^2\,n\right )}{{\left (a\,d-b\,c\right )}^3\,{\left (c+d\,x\right )}^n\,\left (n^3-6\,n^2+11\,n-6\right )}-\frac {2\,b^2\,d^2\,x^3\,{\left (a+b\,x\right )}^{n-4}\,\left (4\,a\,d-a\,d\,n+b\,c\,n\right )}{{\left (a\,d-b\,c\right )}^3\,{\left (c+d\,x\right )}^n\,\left (n^3-6\,n^2+11\,n-6\right )} \]
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