\(\int x^2 \cosh (b x) \text {Chi}(b x) \, dx\) [112]

Optimal result

Integrand size = 12, antiderivative size = 90 \[ \int x^2 \cosh (b x) \text {Chi}(b x) \, dx=\frac {3 x}{4 b^2}-\frac {2 x \cosh (b x) \text {Chi}(b x)}{b^2}+\frac {5 \cosh (b x) \sinh (b x)}{4 b^3}+\frac {2 \text {Chi}(b x) \sinh (b x)}{b^3}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {x \sinh ^2(b x)}{2 b^2}-\frac {\text {Shi}(2 b x)}{b^3} \] Output:

3/4*x/b^2-2*x*cosh(b*x)*Chi(b*x)/b^2+5/4*cosh(b*x)*sinh(b*x)/b^3+2*Chi(b*x 
)*sinh(b*x)/b^3+x^2*Chi(b*x)*sinh(b*x)/b-1/2*x*sinh(b*x)^2/b^2-Shi(2*b*x)/ 
b^3
 

Mathematica [A] (verified)

Time = 0.05 (sec) , antiderivative size = 64, normalized size of antiderivative = 0.71 \[ \int x^2 \cosh (b x) \text {Chi}(b x) \, dx=\frac {8 b x-2 b x \cosh (2 b x)+8 \text {Chi}(b x) \left (-2 b x \cosh (b x)+\left (2+b^2 x^2\right ) \sinh (b x)\right )+5 \sinh (2 b x)-8 \text {Shi}(2 b x)}{8 b^3} \] Input:

Integrate[x^2*Cosh[b*x]*CoshIntegral[b*x],x]
 

Output:

(8*b*x - 2*b*x*Cosh[2*b*x] + 8*CoshIntegral[b*x]*(-2*b*x*Cosh[b*x] + (2 + 
b^2*x^2)*Sinh[b*x]) + 5*Sinh[2*b*x] - 8*SinhIntegral[2*b*x])/(8*b^3)
 

Rubi [A] (verified)

Time = 0.88 (sec) , antiderivative size = 139, normalized size of antiderivative = 1.54, number of steps used = 19, number of rules used = 19, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 1.583, Rules used = {7097, 27, 5895, 3042, 25, 3115, 24, 7103, 27, 3042, 3115, 24, 7095, 27, 5971, 27, 3042, 26, 3779}

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.

\(\displaystyle \int x^2 \text {Chi}(b x) \cosh (b x) \, dx\)

\(\Big \downarrow \) 7097

\(\displaystyle -\frac {2 \int x \text {Chi}(b x) \sinh (b x)dx}{b}-\int \frac {x \cosh (b x) \sinh (b x)}{b}dx+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}\)

\(\Big \downarrow \) 27

\(\displaystyle -\frac {2 \int x \text {Chi}(b x) \sinh (b x)dx}{b}-\frac {\int x \cosh (b x) \sinh (b x)dx}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}\)

\(\Big \downarrow \) 5895

\(\displaystyle -\frac {2 \int x \text {Chi}(b x) \sinh (b x)dx}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}-\frac {\int \sinh ^2(b x)dx}{2 b}}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}\)

\(\Big \downarrow \) 3042

\(\displaystyle -\frac {2 \int x \text {Chi}(b x) \sinh (b x)dx}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}-\frac {\int -\sin (i b x)^2dx}{2 b}}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}\)

\(\Big \downarrow \) 25

\(\displaystyle -\frac {2 \int x \text {Chi}(b x) \sinh (b x)dx}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\int \sin (i b x)^2dx}{2 b}}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}\)

\(\Big \downarrow \) 3115

\(\displaystyle -\frac {2 \int x \text {Chi}(b x) \sinh (b x)dx}{b}-\frac {\frac {\frac {\int 1dx}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}+\frac {x \sinh ^2(b x)}{2 b}}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}\)

\(\Big \downarrow \) 24

\(\displaystyle -\frac {2 \int x \text {Chi}(b x) \sinh (b x)dx}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 7103

\(\displaystyle -\frac {2 \left (-\frac {\int \cosh (b x) \text {Chi}(b x)dx}{b}-\int \frac {\cosh ^2(b x)}{b}dx+\frac {x \text {Chi}(b x) \cosh (b x)}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 27

\(\displaystyle -\frac {2 \left (-\frac {\int \cosh (b x) \text {Chi}(b x)dx}{b}-\frac {\int \cosh ^2(b x)dx}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 3042

\(\displaystyle -\frac {2 \left (-\frac {\int \cosh (b x) \text {Chi}(b x)dx}{b}-\frac {\int \sin \left (i b x+\frac {\pi }{2}\right )^2dx}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 3115

\(\displaystyle -\frac {2 \left (-\frac {\int \cosh (b x) \text {Chi}(b x)dx}{b}-\frac {\frac {\int 1dx}{2}+\frac {\sinh (b x) \cosh (b x)}{2 b}}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 24

\(\displaystyle -\frac {2 \left (-\frac {\int \cosh (b x) \text {Chi}(b x)dx}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}-\frac {\frac {\sinh (b x) \cosh (b x)}{2 b}+\frac {x}{2}}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 7095

\(\displaystyle -\frac {2 \left (-\frac {\frac {\text {Chi}(b x) \sinh (b x)}{b}-\int \frac {\cosh (b x) \sinh (b x)}{b x}dx}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}-\frac {\frac {\sinh (b x) \cosh (b x)}{2 b}+\frac {x}{2}}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 27

\(\displaystyle -\frac {2 \left (-\frac {\frac {\text {Chi}(b x) \sinh (b x)}{b}-\frac {\int \frac {\cosh (b x) \sinh (b x)}{x}dx}{b}}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}-\frac {\frac {\sinh (b x) \cosh (b x)}{2 b}+\frac {x}{2}}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 5971

\(\displaystyle -\frac {2 \left (-\frac {\frac {\text {Chi}(b x) \sinh (b x)}{b}-\frac {\int \frac {\sinh (2 b x)}{2 x}dx}{b}}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}-\frac {\frac {\sinh (b x) \cosh (b x)}{2 b}+\frac {x}{2}}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 27

\(\displaystyle -\frac {2 \left (-\frac {\frac {\text {Chi}(b x) \sinh (b x)}{b}-\frac {\int \frac {\sinh (2 b x)}{x}dx}{2 b}}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}-\frac {\frac {\sinh (b x) \cosh (b x)}{2 b}+\frac {x}{2}}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 3042

\(\displaystyle -\frac {2 \left (-\frac {\frac {\text {Chi}(b x) \sinh (b x)}{b}-\frac {\int -\frac {i \sin (2 i b x)}{x}dx}{2 b}}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}-\frac {\frac {\sinh (b x) \cosh (b x)}{2 b}+\frac {x}{2}}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 26

\(\displaystyle -\frac {2 \left (-\frac {\frac {\text {Chi}(b x) \sinh (b x)}{b}+\frac {i \int \frac {\sin (2 i b x)}{x}dx}{2 b}}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}-\frac {\frac {\sinh (b x) \cosh (b x)}{2 b}+\frac {x}{2}}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

\(\Big \downarrow \) 3779

\(\displaystyle -\frac {2 \left (-\frac {\frac {\text {Chi}(b x) \sinh (b x)}{b}-\frac {\text {Shi}(2 b x)}{2 b}}{b}+\frac {x \text {Chi}(b x) \cosh (b x)}{b}-\frac {\frac {\sinh (b x) \cosh (b x)}{2 b}+\frac {x}{2}}{b}\right )}{b}+\frac {x^2 \text {Chi}(b x) \sinh (b x)}{b}-\frac {\frac {x \sinh ^2(b x)}{2 b}+\frac {\frac {x}{2}-\frac {\sinh (b x) \cosh (b x)}{2 b}}{2 b}}{b}\)

Input:

Int[x^2*Cosh[b*x]*CoshIntegral[b*x],x]
 

Output:

(x^2*CoshIntegral[b*x]*Sinh[b*x])/b - ((x*Sinh[b*x]^2)/(2*b) + (x/2 - (Cos 
h[b*x]*Sinh[b*x])/(2*b))/(2*b))/b - (2*((x*Cosh[b*x]*CoshIntegral[b*x])/b 
- (x/2 + (Cosh[b*x]*Sinh[b*x])/(2*b))/b - ((CoshIntegral[b*x]*Sinh[b*x])/b 
 - SinhIntegral[2*b*x]/(2*b))/b))/b
 

Defintions of rubi rules used

rule 24

Int[a_, x_Symbol] :> Simp[a*x, x] /; FreeQ[a, x]
 

rule 25

Int[-(Fx_), x_Symbol] :> Simp[Identity[-1]   Int[Fx, x], x]
 

rule 26

Int[(Complex[0, a_])*(Fx_), x_Symbol] :> Simp[(Complex[Identity[0], a])   I 
nt[Fx, x], x] /; FreeQ[a, x] && EqQ[a^2, 1]
 

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 3042

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

rule 3115

Int[((b_.)*sin[(c_.) + (d_.)*(x_)])^(n_), x_Symbol] :> Simp[(-b)*Cos[c + d* 
x]*((b*Sin[c + d*x])^(n - 1)/(d*n)), x] + Simp[b^2*((n - 1)/n)   Int[(b*Sin 
[c + d*x])^(n - 2), x], x] /; FreeQ[{b, c, d}, x] && GtQ[n, 1] && IntegerQ[ 
2*n]
 

rule 3779

Int[sin[(e_.) + (Complex[0, fz_])*(f_.)*(x_)]/((c_.) + (d_.)*(x_)), x_Symbo 
l] :> Simp[I*(SinhIntegral[c*f*(fz/d) + f*fz*x]/d), x] /; FreeQ[{c, d, e, f 
, fz}, x] && EqQ[d*e - c*f*fz*I, 0]
 

rule 5895

Int[Cosh[(a_.) + (b_.)*(x_)^(n_.)]*(x_)^(m_.)*Sinh[(a_.) + (b_.)*(x_)^(n_.) 
]^(p_.), x_Symbol] :> Simp[x^(m - n + 1)*(Sinh[a + b*x^n]^(p + 1)/(b*n*(p + 
 1))), x] - Simp[(m - n + 1)/(b*n*(p + 1))   Int[x^(m - n)*Sinh[a + b*x^n]^ 
(p + 1), x], x] /; FreeQ[{a, b, p}, x] && LtQ[0, n, m + 1] && NeQ[p, -1]
 

rule 5971

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

rule 7095

Int[Cosh[(a_.) + (b_.)*(x_)]*CoshIntegral[(c_.) + (d_.)*(x_)], x_Symbol] :> 
 Simp[Sinh[a + b*x]*(CoshIntegral[c + d*x]/b), x] - Simp[d/b   Int[Sinh[a + 
 b*x]*(Cosh[c + d*x]/(c + d*x)), x], x] /; FreeQ[{a, b, c, d}, x]
 

rule 7097

Int[Cosh[(a_.) + (b_.)*(x_)]*CoshIntegral[(c_.) + (d_.)*(x_)]*((e_.) + (f_. 
)*(x_))^(m_.), x_Symbol] :> Simp[(e + f*x)^m*Sinh[a + b*x]*(CoshIntegral[c 
+ d*x]/b), x] + (-Simp[d/b   Int[(e + f*x)^m*Sinh[a + b*x]*(Cosh[c + d*x]/( 
c + d*x)), x], x] - Simp[f*(m/b)   Int[(e + f*x)^(m - 1)*Sinh[a + b*x]*Cosh 
Integral[c + d*x], x], x]) /; FreeQ[{a, b, c, d, e, f}, x] && IGtQ[m, 0]
 

rule 7103

Int[CoshIntegral[(c_.) + (d_.)*(x_)]*((e_.) + (f_.)*(x_))^(m_.)*Sinh[(a_.) 
+ (b_.)*(x_)], x_Symbol] :> Simp[(e + f*x)^m*Cosh[a + b*x]*(CoshIntegral[c 
+ d*x]/b), x] + (-Simp[d/b   Int[(e + f*x)^m*Cosh[a + b*x]*(Cosh[c + d*x]/( 
c + d*x)), x], x] - Simp[f*(m/b)   Int[(e + f*x)^(m - 1)*Cosh[a + b*x]*Cosh 
Integral[c + d*x], x], x]) /; FreeQ[{a, b, c, d, e, f}, x] && IGtQ[m, 0]
 

Maple [A] (verified)

Time = 0.95 (sec) , antiderivative size = 68, normalized size of antiderivative = 0.76

method	result	size
derivativedivides	\(\frac {\operatorname {Chi}\left (b x \right ) \left (b^{2} x^{2} \sinh \left (b x \right )-2 b x \cosh \left (b x \right )+2 \sinh \left (b x \right )\right )-\frac {b x \cosh \left (b x \right )^{2}}{2}+\frac {5 \cosh \left (b x \right ) \sinh \left (b x \right )}{4}+\frac {5 b x}{4}-\operatorname {Shi}\left (2 b x \right )}{b^{3}}\)	\(68\)
default	\(\frac {\operatorname {Chi}\left (b x \right ) \left (b^{2} x^{2} \sinh \left (b x \right )-2 b x \cosh \left (b x \right )+2 \sinh \left (b x \right )\right )-\frac {b x \cosh \left (b x \right )^{2}}{2}+\frac {5 \cosh \left (b x \right ) \sinh \left (b x \right )}{4}+\frac {5 b x}{4}-\operatorname {Shi}\left (2 b x \right )}{b^{3}}\)	\(68\)

Input:

int(x^2*cosh(b*x)*Chi(b*x),x,method=_RETURNVERBOSE)
 

Output:

1/b^3*(Chi(b*x)*(b^2*x^2*sinh(b*x)-2*b*x*cosh(b*x)+2*sinh(b*x))-1/2*b*x*co 
sh(b*x)^2+5/4*cosh(b*x)*sinh(b*x)+5/4*b*x-Shi(2*b*x))
 

Fricas [F]

\[ \int x^2 \cosh (b x) \text {Chi}(b x) \, dx=\int { x^{2} {\rm Chi}\left (b x\right ) \cosh \left (b x\right ) \,d x } \] Input:

integrate(x^2*cosh(b*x)*Chi(b*x),x, algorithm="fricas")
 

Output:

integral(x^2*cosh(b*x)*cosh_integral(b*x), x)
 

Sympy [F]

\[ \int x^2 \cosh (b x) \text {Chi}(b x) \, dx=\int x^{2} \cosh {\left (b x \right )} \operatorname {Chi}\left (b x\right )\, dx \] Input:

integrate(x**2*cosh(b*x)*Chi(b*x),x)
 

Output:

Integral(x**2*cosh(b*x)*Chi(b*x), x)
 

Maxima [F]

\[ \int x^2 \cosh (b x) \text {Chi}(b x) \, dx=\int { x^{2} {\rm Chi}\left (b x\right ) \cosh \left (b x\right ) \,d x } \] Input:

integrate(x^2*cosh(b*x)*Chi(b*x),x, algorithm="maxima")
 

Output:

integrate(x^2*Chi(b*x)*cosh(b*x), x)
 

Giac [F]

\[ \int x^2 \cosh (b x) \text {Chi}(b x) \, dx=\int { x^{2} {\rm Chi}\left (b x\right ) \cosh \left (b x\right ) \,d x } \] Input:

integrate(x^2*cosh(b*x)*Chi(b*x),x, algorithm="giac")
 

Output:

integrate(x^2*Chi(b*x)*cosh(b*x), x)
 

Mupad [F(-1)]

Timed out. \[ \int x^2 \cosh (b x) \text {Chi}(b x) \, dx=\int x^2\,\mathrm {coshint}\left (b\,x\right )\,\mathrm {cosh}\left (b\,x\right ) \,d x \] Input:

int(x^2*coshint(b*x)*cosh(b*x),x)
 

Output:

int(x^2*coshint(b*x)*cosh(b*x), x)
 

Reduce [F]

\[ \int x^2 \cosh (b x) \text {Chi}(b x) \, dx=\int \chi \left (b x \right ) \cosh \left (b x \right ) x^{2}d x \] Input:

int(x^2*cosh(b*x)*Chi(b*x),x)
 

Output:

int(chi(b*x)*cosh(b*x)*x**2,x)