Integrand size = 14, antiderivative size = 74 \[ \int (c+d x)^3 \text {log$\Gamma $}(a+b x) \, dx=-\frac {6 d^3 \psi ^{(-5)}(a+b x)}{b^4}+\frac {6 d^2 (c+d x) \psi ^{(-4)}(a+b x)}{b^3}-\frac {3 d (c+d x)^2 \psi ^{(-3)}(a+b x)}{b^2}+\frac {(c+d x)^3 \psi ^{(-2)}(a+b x)}{b} \] Output:
-6*d^3*Psi(-5,b*x+a)/b^4+6*d^2*(d*x+c)*Psi(-4,b*x+a)/b^3-3*d*(d*x+c)^2*Psi (-3,b*x+a)/b^2+(d*x+c)^3*Psi(-2,b*x+a)/b
Time = 0.04 (sec) , antiderivative size = 69, normalized size of antiderivative = 0.93 \[ \int (c+d x)^3 \text {log$\Gamma $}(a+b x) \, dx=\frac {-6 d^3 \psi ^{(-5)}(a+b x)+b (c+d x) \left (6 d^2 \psi ^{(-4)}(a+b x)+b (c+d x) (-3 d \psi ^{(-3)}(a+b x)+b (c+d x) \psi ^{(-2)}(a+b x))\right )}{b^4} \] Input:
Integrate[(c + d*x)^3*LogGamma[a + b*x],x]
Output:
(-6*d^3*PolyGamma[-5, a + b*x] + b*(c + d*x)*(6*d^2*PolyGamma[-4, a + b*x] + b*(c + d*x)*(-3*d*PolyGamma[-3, a + b*x] + b*(c + d*x)*PolyGamma[-2, a + b*x])))/b^4
Time = 0.47 (sec) , antiderivative size = 80, normalized size of antiderivative = 1.08, number of steps used = 4, number of rules used = 4, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.286, Rules used = {7122, 7125, 7125, 7124}
Below are the steps used by Rubi to obtain the solution. The rule number used for the transformation is given above next to the arrow. The rules definitions used are listed below.
\(\displaystyle \int (c+d x)^3 \text {log$\Gamma $}(a+b x) \, dx\) |
\(\Big \downarrow \) 7122 |
\(\displaystyle \frac {(c+d x)^3 \psi ^{(-2)}(a+b x)}{b}-\frac {3 d \int (c+d x)^2 \psi ^{(-2)}(a+b x)dx}{b}\) |
\(\Big \downarrow \) 7125 |
\(\displaystyle \frac {(c+d x)^3 \psi ^{(-2)}(a+b x)}{b}-\frac {3 d \left (\frac {(c+d x)^2 \psi ^{(-3)}(a+b x)}{b}-\frac {2 d \int (c+d x) \psi ^{(-3)}(a+b x)dx}{b}\right )}{b}\) |
\(\Big \downarrow \) 7125 |
\(\displaystyle \frac {(c+d x)^3 \psi ^{(-2)}(a+b x)}{b}-\frac {3 d \left (\frac {(c+d x)^2 \psi ^{(-3)}(a+b x)}{b}-\frac {2 d \left (\frac {(c+d x) \psi ^{(-4)}(a+b x)}{b}-\frac {d \int \psi ^{(-4)}(a+b x)dx}{b}\right )}{b}\right )}{b}\) |
\(\Big \downarrow \) 7124 |
\(\displaystyle \frac {(c+d x)^3 \psi ^{(-2)}(a+b x)}{b}-\frac {3 d \left (\frac {(c+d x)^2 \psi ^{(-3)}(a+b x)}{b}-\frac {2 d \left (\frac {(c+d x) \psi ^{(-4)}(a+b x)}{b}-\frac {d \psi ^{(-5)}(a+b x)}{b^2}\right )}{b}\right )}{b}\) |
Input:
Int[(c + d*x)^3*LogGamma[a + b*x],x]
Output:
(-3*d*((-2*d*(-((d*PolyGamma[-5, a + b*x])/b^2) + ((c + d*x)*PolyGamma[-4, a + b*x])/b))/b + ((c + d*x)^2*PolyGamma[-3, a + b*x])/b))/b + ((c + d*x) ^3*PolyGamma[-2, a + b*x])/b
Int[LogGamma[(a_.) + (b_.)*(x_)]*((c_.) + (d_.)*(x_))^(m_.), x_Symbol] :> S imp[(c + d*x)^m*(PolyGamma[-2, a + b*x]/b), x] - Simp[d*(m/b) Int[(c + d* x)^(m - 1)*PolyGamma[-2, a + b*x], x], x] /; FreeQ[{a, b, c, d}, x] && IGtQ [m, 0]
Int[PolyGamma[n_, (a_.) + (b_.)*(x_)], x_Symbol] :> Simp[PolyGamma[n - 1, a + b*x]/b, x] /; FreeQ[{a, b, n}, x]
Int[((c_.) + (d_.)*(x_))^(m_.)*PolyGamma[n_, (a_.) + (b_.)*(x_)], x_Symbol] :> Simp[(c + d*x)^m*(PolyGamma[n - 1, a + b*x]/b), x] - Simp[d*(m/b) Int [(c + d*x)^(m - 1)*PolyGamma[n - 1, a + b*x], x], x] /; FreeQ[{a, b, c, d, n}, x] && GtQ[m, 0]
Time = 0.40 (sec) , antiderivative size = 135, normalized size of antiderivative = 1.82
method | result | size |
derivativedivides | \(\frac {\Psi \left (-2, b x +a \right ) \left (d x +c \right )^{3}-\frac {3 d \left (\Psi \left (-3, b x +a \right ) \left (\frac {d \left (b x +a \right )}{b}-\frac {a d}{b}+c \right )^{2}-\frac {2 d \left (\Psi \left (-4, b x +a \right ) \left (\frac {d \left (b x +a \right )}{b}-\frac {a d}{b}+c \right )-\frac {d \Psi \left (-5, b x +a \right )}{b}\right )}{b}\right )}{b}+\frac {\ln \left (2 \pi \right ) \left (\frac {d \left (b x +a \right )}{b}-\frac {a d}{b}+c \right )^{4} b}{8 d}}{b}\) | \(135\) |
default | \(\frac {\Psi \left (-2, b x +a \right ) \left (d x +c \right )^{3}-\frac {3 d \left (\Psi \left (-3, b x +a \right ) \left (\frac {d \left (b x +a \right )}{b}-\frac {a d}{b}+c \right )^{2}-\frac {2 d \left (\Psi \left (-4, b x +a \right ) \left (\frac {d \left (b x +a \right )}{b}-\frac {a d}{b}+c \right )-\frac {d \Psi \left (-5, b x +a \right )}{b}\right )}{b}\right )}{b}+\frac {\ln \left (2 \pi \right ) \left (\frac {d \left (b x +a \right )}{b}-\frac {a d}{b}+c \right )^{4} b}{8 d}}{b}\) | \(135\) |
parts | \(\frac {d^{3} \operatorname {lnGAMMA}\left (b x +a \right ) x^{4}}{4}+d^{2} \operatorname {lnGAMMA}\left (b x +a \right ) c \,x^{3}+\frac {3 d \operatorname {lnGAMMA}\left (b x +a \right ) c^{2} x^{2}}{2}+\operatorname {lnGAMMA}\left (b x +a \right ) c^{3} x +\frac {\operatorname {lnGAMMA}\left (b x +a \right ) c^{4}}{4 d}-\frac {\Psi \left (-1, b x +a \right ) \left (d x +c \right )^{4}-\frac {4 d \left (\Psi \left (-2, b x +a \right ) \left (\frac {d \left (b x +a \right )}{b}-\frac {a d}{b}+c \right )^{3}-\frac {3 d \left (\Psi \left (-3, b x +a \right ) \left (\frac {d \left (b x +a \right )}{b}-\frac {a d}{b}+c \right )^{2}-\frac {2 d \left (\Psi \left (-4, b x +a \right ) \left (\frac {d \left (b x +a \right )}{b}-\frac {a d}{b}+c \right )-\frac {d \Psi \left (-5, b x +a \right )}{b}\right )}{b}\right )}{b}\right )}{b}}{4 d}\) | \(210\) |
Input:
int((d*x+c)^3*lnGAMMA(b*x+a),x,method=_RETURNVERBOSE)
Output:
1/b*(Psi(-2,b*x+a)*(d*x+c)^3-3*d/b*(Psi(-3,b*x+a)*(d/b*(b*x+a)-a*d/b+c)^2- 2*d/b*(Psi(-4,b*x+a)*(d/b*(b*x+a)-a*d/b+c)-d/b*Psi(-5,b*x+a)))+1/8*ln(2*Pi )*(d/b*(b*x+a)-a*d/b+c)^4/d*b)
\[ \int (c+d x)^3 \text {log$\Gamma $}(a+b x) \, dx=\int { {\left (d x + c\right )}^{3} {\rm lngamma}\left (b x + a\right ) \,d x } \] Input:
integrate((d*x+c)^3*lngamma(b*x+a),x, algorithm="fricas")
Output:
integral((d^3*x^3 + 3*c*d^2*x^2 + 3*c^2*d*x + c^3)*lngamma(b*x + a), x)
\[ \int (c+d x)^3 \text {log$\Gamma $}(a+b x) \, dx=\int \left (c + d x\right )^{3} \operatorname {lnGAMMA}{\left (a + b x \right )}\, dx \] Input:
integrate((d*x+c)**3*lnGAMMA(b*x+a),x)
Output:
Integral((c + d*x)**3*lnGAMMA(a + b*x), x)
\[ \int (c+d x)^3 \text {log$\Gamma $}(a+b x) \, dx=\int { {\left (d x + c\right )}^{3} {\rm lngamma}\left (b x + a\right ) \,d x } \] Input:
integrate((d*x+c)^3*lngamma(b*x+a),x, algorithm="maxima")
Output:
integrate((d*x + c)^3*lngamma(b*x + a), x)
\[ \int (c+d x)^3 \text {log$\Gamma $}(a+b x) \, dx=\int { {\left (d x + c\right )}^{3} {\rm lngamma}\left (b x + a\right ) \,d x } \] Input:
integrate((d*x+c)^3*lngamma(b*x+a),x, algorithm="giac")
Output:
integrate((d*x + c)^3*lngamma(b*x + a), x)
Timed out. \[ \int (c+d x)^3 \text {log$\Gamma $}(a+b x) \, dx=\int \mathrm {lnGAMMA}\left (a+b\,x\right )\,{\left (c+d\,x\right )}^3 \,d x \] Input:
int(lnGAMMA(a + b*x)*(c + d*x)^3,x)
Output:
int(lnGAMMA(a + b*x)*(c + d*x)^3, x)
\[ \int (c+d x)^3 \text {log$\Gamma $}(a+b x) \, dx=\int \left (d x +c \right )^{3} \mathit {lnGAMMA}\left (b x +a \right )d x \] Input:
int((d*x+c)^3*lnGAMMA(b*x+a),x)
Output:
int((d*x+c)^3*lnGAMMA(b*x+a),x)