Integrand size = 20, antiderivative size = 67 \[ \int \sqrt {a+a x} \sqrt {c-c x} \, dx=\frac {1}{2} x \sqrt {a+a x} \sqrt {c-c x}+\sqrt {a} \sqrt {c} \arctan \left (\frac {\sqrt {c} \sqrt {a+a x}}{\sqrt {a} \sqrt {c-c x}}\right ) \]
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Time = 0.02 (sec) , antiderivative size = 67, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.200, Rules used = {38, 65, 223, 209} \[ \int \sqrt {a+a x} \sqrt {c-c x} \, dx=\sqrt {a} \sqrt {c} \arctan \left (\frac {\sqrt {c} \sqrt {a x+a}}{\sqrt {a} \sqrt {c-c x}}\right )+\frac {1}{2} x \sqrt {a x+a} \sqrt {c-c x} \]
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Rule 38
Rule 65
Rule 209
Rule 223
Rubi steps \begin{align*} \text {integral}& = \frac {1}{2} x \sqrt {a+a x} \sqrt {c-c x}+\frac {1}{2} (a c) \int \frac {1}{\sqrt {a+a x} \sqrt {c-c x}} \, dx \\ & = \frac {1}{2} x \sqrt {a+a x} \sqrt {c-c x}+c \text {Subst}\left (\int \frac {1}{\sqrt {2 c-\frac {c x^2}{a}}} \, dx,x,\sqrt {a+a x}\right ) \\ & = \frac {1}{2} x \sqrt {a+a x} \sqrt {c-c x}+c \text {Subst}\left (\int \frac {1}{1+\frac {c x^2}{a}} \, dx,x,\frac {\sqrt {a+a x}}{\sqrt {c-c x}}\right ) \\ & = \frac {1}{2} x \sqrt {a+a x} \sqrt {c-c x}+\sqrt {a} \sqrt {c} \tan ^{-1}\left (\frac {\sqrt {c} \sqrt {a+a x}}{\sqrt {a} \sqrt {c-c x}}\right ) \\ \end{align*}
Time = 0.08 (sec) , antiderivative size = 69, normalized size of antiderivative = 1.03 \[ \int \sqrt {a+a x} \sqrt {c-c x} \, dx=\frac {\sqrt {a (1+x)} \left (x \sqrt {1+x} \sqrt {c-c x}-2 \sqrt {c} \arcsin \left (\frac {\sqrt {c-c x}}{\sqrt {2} \sqrt {c}}\right )\right )}{2 \sqrt {1+x}} \]
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Time = 0.18 (sec) , antiderivative size = 85, normalized size of antiderivative = 1.27
method | result | size |
risch | \(-\frac {x \left (-1+x \right ) \left (1+x \right ) a c}{2 \sqrt {a \left (1+x \right )}\, \sqrt {-c \left (-1+x \right )}}+\frac {\arctan \left (\frac {\sqrt {a c}\, x}{\sqrt {-a c \,x^{2}+a c}}\right ) a c \sqrt {-a \left (1+x \right ) c \left (-1+x \right )}}{2 \sqrt {a c}\, \sqrt {a \left (1+x \right )}\, \sqrt {-c \left (-1+x \right )}}\) | \(85\) |
default | \(-\frac {\sqrt {a x +a}\, \left (-c x +c \right )^{\frac {3}{2}}}{2 c}+\frac {a \left (\frac {\sqrt {-c x +c}\, \sqrt {a x +a}}{a}+\frac {c \sqrt {\left (-c x +c \right ) \left (a x +a \right )}\, \arctan \left (\frac {\sqrt {a c}\, x}{\sqrt {-a c \,x^{2}+a c}}\right )}{\sqrt {-c x +c}\, \sqrt {a x +a}\, \sqrt {a c}}\right )}{2}\) | \(102\) |
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Time = 0.23 (sec) , antiderivative size = 127, normalized size of antiderivative = 1.90 \[ \int \sqrt {a+a x} \sqrt {c-c x} \, dx=\left [\frac {1}{2} \, \sqrt {a x + a} \sqrt {-c x + c} x + \frac {1}{4} \, \sqrt {-a c} \log \left (2 \, a c x^{2} + 2 \, \sqrt {-a c} \sqrt {a x + a} \sqrt {-c x + c} x - a c\right ), \frac {1}{2} \, \sqrt {a x + a} \sqrt {-c x + c} x - \frac {1}{2} \, \sqrt {a c} \arctan \left (\frac {\sqrt {a c} \sqrt {a x + a} \sqrt {-c x + c} x}{a c x^{2} - a c}\right )\right ] \]
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\[ \int \sqrt {a+a x} \sqrt {c-c x} \, dx=\int \sqrt {a \left (x + 1\right )} \sqrt {- c \left (x - 1\right )}\, dx \]
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Time = 0.29 (sec) , antiderivative size = 28, normalized size of antiderivative = 0.42 \[ \int \sqrt {a+a x} \sqrt {c-c x} \, dx=\frac {a c \arcsin \left (x\right )}{2 \, \sqrt {a c}} + \frac {1}{2} \, \sqrt {-a c x^{2} + a c} x \]
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Leaf count of result is larger than twice the leaf count of optimal. 173 vs. \(2 (49) = 98\).
Time = 0.38 (sec) , antiderivative size = 173, normalized size of antiderivative = 2.58 \[ \int \sqrt {a+a x} \sqrt {c-c x} \, dx=-\frac {{\left (\frac {2 \, a^{2} c \log \left ({\left | -\sqrt {-a c} \sqrt {a x + a} + \sqrt {-{\left (a x + a\right )} a c + 2 \, a^{2} c} \right |}\right )}{\sqrt {-a c}} - \sqrt {-{\left (a x + a\right )} a c + 2 \, a^{2} c} \sqrt {a x + a}\right )} {\left | a \right |}}{a^{2}} + \frac {{\left (\frac {2 \, a^{3} c \log \left ({\left | -\sqrt {-a c} \sqrt {a x + a} + \sqrt {-{\left (a x + a\right )} a c + 2 \, a^{2} c} \right |}\right )}{\sqrt {-a c}} + \sqrt {-{\left (a x + a\right )} a c + 2 \, a^{2} c} \sqrt {a x + a} {\left (a x - 2 \, a\right )}\right )} {\left | a \right |}}{2 \, a^{3}} \]
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Time = 0.26 (sec) , antiderivative size = 59, normalized size of antiderivative = 0.88 \[ \int \sqrt {a+a x} \sqrt {c-c x} \, dx=\frac {x\,\sqrt {a+a\,x}\,\sqrt {c-c\,x}}{2}-\frac {\sqrt {a}\,\sqrt {-c}\,\ln \left (\sqrt {-c}\,\sqrt {a\,\left (x+1\right )}\,\sqrt {-c\,\left (x-1\right )}-\sqrt {a}\,c\,x\right )}{2} \]
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