\(\int x \arcsin (a x)^n \, dx\) [177]

Optimal result

Integrand size = 8, antiderivative size = 85 \[ \int x \arcsin (a x)^n \, dx=-\frac {2^{-3-n} (-i \arcsin (a x))^{-n} \arcsin (a x)^n \Gamma (1+n,-2 i \arcsin (a x))}{a^2}-\frac {2^{-3-n} (i \arcsin (a x))^{-n} \arcsin (a x)^n \Gamma (1+n,2 i \arcsin (a x))}{a^2} \] Output:

-2^(-3-n)*arcsin(a*x)^n*GAMMA(1+n,-2*I*arcsin(a*x))/a^2/((-I*arcsin(a*x))^ 
n)-2^(-3-n)*arcsin(a*x)^n*GAMMA(1+n,2*I*arcsin(a*x))/a^2/((I*arcsin(a*x))^ 
n)
 

Mathematica [A] (verified)

Time = 0.01 (sec) , antiderivative size = 75, normalized size of antiderivative = 0.88 \[ \int x \arcsin (a x)^n \, dx=-\frac {2^{-3-n} \arcsin (a x)^n \left (\arcsin (a x)^2\right )^{-n} \left ((i \arcsin (a x))^n \Gamma (1+n,-2 i \arcsin (a x))+(-i \arcsin (a x))^n \Gamma (1+n,2 i \arcsin (a x))\right )}{a^2} \] Input:

Integrate[x*ArcSin[a*x]^n,x]
 

Output:

-((2^(-3 - n)*ArcSin[a*x]^n*((I*ArcSin[a*x])^n*Gamma[1 + n, (-2*I)*ArcSin[ 
a*x]] + ((-I)*ArcSin[a*x])^n*Gamma[1 + n, (2*I)*ArcSin[a*x]]))/(a^2*(ArcSi 
n[a*x]^2)^n))
 

Rubi [A] (verified)

Time = 0.36 (sec) , antiderivative size = 86, normalized size of antiderivative = 1.01, number of steps used = 7, number of rules used = 6, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.750, Rules used = {5146, 4906, 27, 3042, 3789, 2612}

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.

\(\displaystyle \int x \arcsin (a x)^n \, dx\)

\(\Big \downarrow \) 5146

\(\displaystyle \frac {\int a x \sqrt {1-a^2 x^2} \arcsin (a x)^nd\arcsin (a x)}{a^2}\)

\(\Big \downarrow \) 4906

\(\displaystyle \frac {\int \frac {1}{2} \arcsin (a x)^n \sin (2 \arcsin (a x))d\arcsin (a x)}{a^2}\)

\(\Big \downarrow \) 27

\(\displaystyle \frac {\int \arcsin (a x)^n \sin (2 \arcsin (a x))d\arcsin (a x)}{2 a^2}\)

\(\Big \downarrow \) 3042

\(\displaystyle \frac {\int \arcsin (a x)^n \sin (2 \arcsin (a x))d\arcsin (a x)}{2 a^2}\)

\(\Big \downarrow \) 3789

\(\displaystyle \frac {\frac {1}{2} i \int e^{-2 i \arcsin (a x)} \arcsin (a x)^nd\arcsin (a x)-\frac {1}{2} i \int e^{2 i \arcsin (a x)} \arcsin (a x)^nd\arcsin (a x)}{2 a^2}\)

\(\Big \downarrow \) 2612

\(\displaystyle \frac {-2^{-n-2} \arcsin (a x)^n (-i \arcsin (a x))^{-n} \Gamma (n+1,-2 i \arcsin (a x))-2^{-n-2} (i \arcsin (a x))^{-n} \arcsin (a x)^n \Gamma (n+1,2 i \arcsin (a x))}{2 a^2}\)

Input:

Int[x*ArcSin[a*x]^n,x]
 

Output:

(-((2^(-2 - n)*ArcSin[a*x]^n*Gamma[1 + n, (-2*I)*ArcSin[a*x]])/((-I)*ArcSi 
n[a*x])^n) - (2^(-2 - n)*ArcSin[a*x]^n*Gamma[1 + n, (2*I)*ArcSin[a*x]])/(I 
*ArcSin[a*x])^n)/(2*a^2)
 

Defintions of rubi rules used

rule 27

Int[(a_)*(Fx_), x_Symbol] :> Simp[a   Int[Fx, x], x] /; FreeQ[a, x] &&  !Ma 
tchQ[Fx, (b_)*(Gx_) /; FreeQ[b, x]]
 

rule 2612

Int[(F_)^((g_.)*((e_.) + (f_.)*(x_)))*((c_.) + (d_.)*(x_))^(m_), x_Symbol] 
:> Simp[(-F^(g*(e - c*(f/d))))*((c + d*x)^FracPart[m]/(d*((-f)*g*(Log[F]/d) 
)^(IntPart[m] + 1)*((-f)*g*Log[F]*((c + d*x)/d))^FracPart[m]))*Gamma[m + 1, 
 ((-f)*g*(Log[F]/d))*(c + d*x)], x] /; FreeQ[{F, c, d, e, f, g, m}, x] && 
!IntegerQ[m]
 

rule 3042

Int[u_, x_Symbol] :> Int[DeactivateTrig[u, x], x] /; FunctionOfTrigOfLinear 
Q[u, x]
 

rule 3789

Int[((c_.) + (d_.)*(x_))^(m_.)*sin[(e_.) + (f_.)*(x_)], x_Symbol] :> Simp[I 
/2   Int[(c + d*x)^m/E^(I*(e + f*x)), x], x] - Simp[I/2   Int[(c + d*x)^m*E 
^(I*(e + f*x)), x], x] /; FreeQ[{c, d, e, f, m}, x]
 

rule 4906

Int[Cos[(a_.) + (b_.)*(x_)]^(p_.)*((c_.) + (d_.)*(x_))^(m_.)*Sin[(a_.) + (b 
_.)*(x_)]^(n_.), x_Symbol] :> Int[ExpandTrigReduce[(c + d*x)^m, Sin[a + b*x 
]^n*Cos[a + b*x]^p, x], x] /; FreeQ[{a, b, c, d, m}, x] && IGtQ[n, 0] && IG 
tQ[p, 0]
 

rule 5146

Int[((a_.) + ArcSin[(c_.)*(x_)]*(b_.))^(n_)*(x_)^(m_.), x_Symbol] :> Simp[1 
/(b*c^(m + 1))   Subst[Int[x^n*Sin[-a/b + x/b]^m*Cos[-a/b + x/b], x], x, a 
+ b*ArcSin[c*x]], x] /; FreeQ[{a, b, c, n}, x] && IGtQ[m, 0]
 

Maple [C] (verified)

Result contains higher order function than in optimal. Order 9 vs. order 4.

Time = 0.10 (sec) , antiderivative size = 138, normalized size of antiderivative = 1.62

method	result	size
default	\(\frac {\sqrt {\pi }\, \left (\frac {2 \arcsin \left (a x \right )^{1+n} \sin \left (2 \arcsin \left (a x \right )\right )}{\sqrt {\pi }\, \left (2+n \right )}-\frac {2^{\frac {1}{2}-n} \sqrt {\arcsin \left (a x \right )}\, \operatorname {LommelS1}\left (n +\frac {3}{2}, \frac {3}{2}, 2 \arcsin \left (a x \right )\right ) \sin \left (2 \arcsin \left (a x \right )\right )}{\sqrt {\pi }\, \left (2+n \right )}-\frac {3 \,2^{-\frac {3}{2}-n} \left (\frac {4}{3}+\frac {2 n}{3}\right ) \left (2 \arcsin \left (a x \right ) \cos \left (2 \arcsin \left (a x \right )\right )-\sin \left (2 \arcsin \left (a x \right )\right )\right ) \operatorname {LommelS1}\left (n +\frac {1}{2}, \frac {1}{2}, 2 \arcsin \left (a x \right )\right )}{\sqrt {\pi }\, \left (2+n \right ) \sqrt {\arcsin \left (a x \right )}}\right )}{4 a^{2}}\)	\(138\)

Input:

int(x*arcsin(a*x)^n,x,method=_RETURNVERBOSE)
 

Output:

1/4*Pi^(1/2)/a^2*(2/Pi^(1/2)/(2+n)*arcsin(a*x)^(1+n)*sin(2*arcsin(a*x))-2^ 
(1/2-n)/Pi^(1/2)/(2+n)*arcsin(a*x)^(1/2)*LommelS1(n+3/2,3/2,2*arcsin(a*x)) 
*sin(2*arcsin(a*x))-3*2^(-3/2-n)/Pi^(1/2)/(2+n)/arcsin(a*x)^(1/2)*(4/3+2/3 
*n)*(2*arcsin(a*x)*cos(2*arcsin(a*x))-sin(2*arcsin(a*x)))*LommelS1(n+1/2,1 
/2,2*arcsin(a*x)))
 

Fricas [F]

\[ \int x \arcsin (a x)^n \, dx=\int { x \arcsin \left (a x\right )^{n} \,d x } \] Input:

integrate(x*arcsin(a*x)^n,x, algorithm="fricas")
 

Output:

integral(x*arcsin(a*x)^n, x)
 

Sympy [F]

\[ \int x \arcsin (a x)^n \, dx=\int x \operatorname {asin}^{n}{\left (a x \right )}\, dx \] Input:

integrate(x*asin(a*x)**n,x)
 

Output:

Integral(x*asin(a*x)**n, x)
 

Maxima [F(-2)]

Exception generated. \[ \int x \arcsin (a x)^n \, dx=\text {Exception raised: RuntimeError} \] Input:

integrate(x*arcsin(a*x)^n,x, algorithm="maxima")
 

Output:

Exception raised: RuntimeError >> ECL says: expt: undefined: 0 to a negati 
ve exponent.
 

Giac [F]

\[ \int x \arcsin (a x)^n \, dx=\int { x \arcsin \left (a x\right )^{n} \,d x } \] Input:

integrate(x*arcsin(a*x)^n,x, algorithm="giac")
 

Output:

integrate(x*arcsin(a*x)^n, x)
 

Mupad [F(-1)]

Timed out. \[ \int x \arcsin (a x)^n \, dx=\int x\,{\mathrm {asin}\left (a\,x\right )}^n \,d x \] Input:

int(x*asin(a*x)^n,x)
 

Output:

int(x*asin(a*x)^n, x)
 

Reduce [F]

\[ \int x \arcsin (a x)^n \, dx=\int \mathit {asin} \left (a x \right )^{n} x d x \] Input:

int(x*asin(a*x)^n,x)
 

Output:

int(asin(a*x)**n*x,x)