\(\int \frac {x \log (x)}{\sqrt {-1+x^2}} \, dx\) [323]

Optimal result

Integrand size = 13, antiderivative size = 34 \[ \int \frac {x \log (x)}{\sqrt {-1+x^2}} \, dx=-\sqrt {-1+x^2}+\arctan \left (\sqrt {-1+x^2}\right )+\sqrt {-1+x^2} \log (x) \] Output:

arctan((x^2-1)^(1/2))-(x^2-1)^(1/2)+ln(x)*(x^2-1)^(1/2)
 

Mathematica [A] (verified)

Time = 0.01 (sec) , antiderivative size = 27, normalized size of antiderivative = 0.79 \[ \int \frac {x \log (x)}{\sqrt {-1+x^2}} \, dx=-\arctan \left (\frac {1}{\sqrt {-1+x^2}}\right )+\sqrt {-1+x^2} (-1+\log (x)) \] Input:

Integrate[(x*Log[x])/Sqrt[-1 + x^2],x]
 

Output:

-ArcTan[1/Sqrt[-1 + x^2]] + Sqrt[-1 + x^2]*(-1 + Log[x])
 

Rubi [A] (verified)

Time = 0.18 (sec) , antiderivative size = 41, normalized size of antiderivative = 1.21, number of steps used = 6, number of rules used = 5, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.385, Rules used = {2776, 243, 60, 73, 216}

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.

\(\displaystyle \int \frac {x \log (x)}{\sqrt {x^2-1}} \, dx\)

\(\Big \downarrow \) 2776

\(\displaystyle \sqrt {x^2-1} \log (x)-\int \frac {\sqrt {x^2-1}}{x}dx\)

\(\Big \downarrow \) 243

\(\displaystyle \sqrt {x^2-1} \log (x)-\frac {1}{2} \int \frac {\sqrt {x^2-1}}{x^2}dx^2\)

\(\Big \downarrow \) 60

\(\displaystyle \frac {1}{2} \left (\int \frac {1}{x^2 \sqrt {x^2-1}}dx^2-2 \sqrt {x^2-1}\right )+\sqrt {x^2-1} \log (x)\)

\(\Big \downarrow \) 73

\(\displaystyle \frac {1}{2} \left (2 \int \frac {1}{x^4+1}d\sqrt {x^2-1}-2 \sqrt {x^2-1}\right )+\sqrt {x^2-1} \log (x)\)

\(\Big \downarrow \) 216

\(\displaystyle \frac {1}{2} \left (2 \arctan \left (\sqrt {x^2-1}\right )-2 \sqrt {x^2-1}\right )+\sqrt {x^2-1} \log (x)\)

Input:

Int[(x*Log[x])/Sqrt[-1 + x^2],x]
 

Output:

(-2*Sqrt[-1 + x^2] + 2*ArcTan[Sqrt[-1 + x^2]])/2 + Sqrt[-1 + x^2]*Log[x]
 

Defintions of rubi rules used

rule 60

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> Simp[ 
(a + b*x)^(m + 1)*((c + d*x)^n/(b*(m + n + 1))), x] + Simp[n*((b*c - a*d)/( 
b*(m + n + 1)))   Int[(a + b*x)^m*(c + d*x)^(n - 1), x], x] /; FreeQ[{a, b, 
 c, d}, x] && GtQ[n, 0] && NeQ[m + n + 1, 0] &&  !(IGtQ[m, 0] && ( !Integer 
Q[n] || (GtQ[m, 0] && LtQ[m - n, 0]))) &&  !ILtQ[m + n + 2, 0] && IntLinear 
Q[a, b, c, d, m, n, x]
 

rule 73

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> With[ 
{p = Denominator[m]}, Simp[p/b   Subst[Int[x^(p*(m + 1) - 1)*(c - a*(d/b) + 
 d*(x^p/b))^n, x], x, (a + b*x)^(1/p)], x]] /; FreeQ[{a, b, c, d}, x] && Lt 
Q[-1, m, 0] && LeQ[-1, n, 0] && LeQ[Denominator[n], Denominator[m]] && IntL 
inearQ[a, b, c, d, m, n, x]
 

rule 216

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(1/(Rt[a, 2]*Rt[b, 2]))*A 
rcTan[Rt[b, 2]*(x/Rt[a, 2])], x] /; FreeQ[{a, b}, x] && PosQ[a/b] && (GtQ[a 
, 0] || GtQ[b, 0])
 

rule 243

Int[(x_)^(m_.)*((a_) + (b_.)*(x_)^2)^(p_), x_Symbol] :> Simp[1/2   Subst[In 
t[x^((m - 1)/2)*(a + b*x)^p, x], x, x^2], x] /; FreeQ[{a, b, m, p}, x] && I 
ntegerQ[(m - 1)/2]
 

rule 2776

Int[((a_.) + Log[(c_.)*(x_)^(n_.)]*(b_.))^(p_.)*((f_.)*(x_))^(m_.)*((d_) + 
(e_.)*(x_)^(r_))^(q_.), x_Symbol] :> Simp[f^m*(d + e*x^r)^(q + 1)*((a + b*L 
og[c*x^n])^p/(e*r*(q + 1))), x] - Simp[b*f^m*n*(p/(e*r*(q + 1)))   Int[(d + 
 e*x^r)^(q + 1)*((a + b*Log[c*x^n])^(p - 1)/x), x], x] /; FreeQ[{a, b, c, d 
, e, f, m, n, q, r}, x] && EqQ[m, r - 1] && IGtQ[p, 0] && (IntegerQ[m] || G 
tQ[f, 0]) && NeQ[r, n] && NeQ[q, -1]
 

Maple [C] (warning: unable to verify)

Result contains higher order function than in optimal. Order 9 vs. order 3.

Time = 0.11 (sec) , antiderivative size = 119, normalized size of antiderivative = 3.50

method	result	size
meijerg	\(-\frac {\sqrt {-\operatorname {signum}\left (x^{2}-1\right )}\, \left (2-2 \sqrt {-x^{2}+1}\right )}{4 \sqrt {\operatorname {signum}\left (x^{2}-1\right )}}+\frac {\sqrt {-\operatorname {signum}\left (x^{2}-1\right )}\, \ln \left (x \right ) \left (2-2 \sqrt {-x^{2}+1}\right )}{2 \sqrt {\operatorname {signum}\left (x^{2}-1\right )}}+\frac {\sqrt {-\operatorname {signum}\left (x^{2}-1\right )}\, \left (-16+16 \sqrt {-x^{2}+1}-32 \ln \left (\frac {1}{2}+\frac {\sqrt {-x^{2}+1}}{2}\right )\right )}{32 \sqrt {\operatorname {signum}\left (x^{2}-1\right )}}\)	\(119\)

Input:

int(x*ln(x)/(x^2-1)^(1/2),x,method=_RETURNVERBOSE)
 

Output:

-1/4/signum(x^2-1)^(1/2)*(-signum(x^2-1))^(1/2)*(2-2*(-x^2+1)^(1/2))+1/2/s 
ignum(x^2-1)^(1/2)*(-signum(x^2-1))^(1/2)*ln(x)*(2-2*(-x^2+1)^(1/2))+1/32/ 
signum(x^2-1)^(1/2)*(-signum(x^2-1))^(1/2)*(-16+16*(-x^2+1)^(1/2)-32*ln(1/ 
2+1/2*(-x^2+1)^(1/2)))
 

Fricas [A] (verification not implemented)

Time = 0.08 (sec) , antiderivative size = 27, normalized size of antiderivative = 0.79 \[ \int \frac {x \log (x)}{\sqrt {-1+x^2}} \, dx=\sqrt {x^{2} - 1} {\left (\log \left (x\right ) - 1\right )} + 2 \, \arctan \left (-x + \sqrt {x^{2} - 1}\right ) \] Input:

integrate(x*log(x)/(x^2-1)^(1/2),x, algorithm="fricas")
 

Output:

sqrt(x^2 - 1)*(log(x) - 1) + 2*arctan(-x + sqrt(x^2 - 1))
                                                                                    
                                                                                    
 

Sympy [A] (verification not implemented)

Time = 1.05 (sec) , antiderivative size = 29, normalized size of antiderivative = 0.85 \[ \int \frac {x \log (x)}{\sqrt {-1+x^2}} \, dx=\sqrt {x^{2} - 1} \log {\left (x \right )} - \begin {cases} \sqrt {x^{2} - 1} - \operatorname {acos}{\left (\frac {1}{x} \right )} & \text {for}\: x > -1 \wedge x < 1 \end {cases} \] Input:

integrate(x*ln(x)/(x**2-1)**(1/2),x)
 

Output:

sqrt(x**2 - 1)*log(x) - Piecewise((sqrt(x**2 - 1) - acos(1/x), (x > -1) & 
(x < 1)))
 

Maxima [A] (verification not implemented)

Time = 0.11 (sec) , antiderivative size = 27, normalized size of antiderivative = 0.79 \[ \int \frac {x \log (x)}{\sqrt {-1+x^2}} \, dx=\sqrt {x^{2} - 1} \log \left (x\right ) - \sqrt {x^{2} - 1} - \arcsin \left (\frac {1}{{\left | x \right |}}\right ) \] Input:

integrate(x*log(x)/(x^2-1)^(1/2),x, algorithm="maxima")
 

Output:

sqrt(x^2 - 1)*log(x) - sqrt(x^2 - 1) - arcsin(1/abs(x))
 

Giac [A] (verification not implemented)

Time = 0.13 (sec) , antiderivative size = 28, normalized size of antiderivative = 0.82 \[ \int \frac {x \log (x)}{\sqrt {-1+x^2}} \, dx=\sqrt {x^{2} - 1} \log \left (x\right ) - \sqrt {x^{2} - 1} + \arctan \left (\sqrt {x^{2} - 1}\right ) \] Input:

integrate(x*log(x)/(x^2-1)^(1/2),x, algorithm="giac")
 

Output:

sqrt(x^2 - 1)*log(x) - sqrt(x^2 - 1) + arctan(sqrt(x^2 - 1))
 

Mupad [F(-1)]

Timed out. \[ \int \frac {x \log (x)}{\sqrt {-1+x^2}} \, dx=\int \frac {x\,\ln \left (x\right )}{\sqrt {x^2-1}} \,d x \] Input:

int((x*log(x))/(x^2 - 1)^(1/2),x)
 

Output:

int((x*log(x))/(x^2 - 1)^(1/2), x)
 

Reduce [B] (verification not implemented)

Time = 0.16 (sec) , antiderivative size = 29, normalized size of antiderivative = 0.85 \[ \int \frac {x \log (x)}{\sqrt {-1+x^2}} \, dx=2 \mathit {atan} \left (\sqrt {x^{2}-1}+x \right )+\sqrt {x^{2}-1}\, \mathrm {log}\left (x \right )-\sqrt {x^{2}-1} \] Input:

int(x*log(x)/(x^2-1)^(1/2),x)
 

Output:

2*atan(sqrt(x**2 - 1) + x) + sqrt(x**2 - 1)*log(x) - sqrt(x**2 - 1)