\(\int \sqrt {a+b \text {arccosh}(c x)} \, dx\) [162]

Optimal result

Integrand size = 12, antiderivative size = 102 \[ \int \sqrt {a+b \text {arccosh}(c x)} \, dx=x \sqrt {a+b \text {arccosh}(c x)}-\frac {\sqrt {b} e^{a/b} \sqrt {\pi } \text {erf}\left (\frac {\sqrt {a+b \text {arccosh}(c x)}}{\sqrt {b}}\right )}{4 c}-\frac {\sqrt {b} e^{-\frac {a}{b}} \sqrt {\pi } \text {erfi}\left (\frac {\sqrt {a+b \text {arccosh}(c x)}}{\sqrt {b}}\right )}{4 c} \] Output:

x*(a+b*arccosh(c*x))^(1/2)-1/4*b^(1/2)*exp(a/b)*Pi^(1/2)*erf((a+b*arccosh( 
c*x))^(1/2)/b^(1/2))/c-1/4*b^(1/2)*Pi^(1/2)*erfi((a+b*arccosh(c*x))^(1/2)/ 
b^(1/2))/c/exp(a/b)
 

Mathematica [A] (verified)

Time = 0.09 (sec) , antiderivative size = 100, normalized size of antiderivative = 0.98 \[ \int \sqrt {a+b \text {arccosh}(c x)} \, dx=\frac {e^{-\frac {a}{b}} \sqrt {a+b \text {arccosh}(c x)} \left (\frac {e^{\frac {2 a}{b}} \Gamma \left (\frac {3}{2},\frac {a}{b}+\text {arccosh}(c x)\right )}{\sqrt {\frac {a}{b}+\text {arccosh}(c x)}}+\frac {\Gamma \left (\frac {3}{2},-\frac {a+b \text {arccosh}(c x)}{b}\right )}{\sqrt {-\frac {a+b \text {arccosh}(c x)}{b}}}\right )}{2 c} \] Input:

Integrate[Sqrt[a + b*ArcCosh[c*x]],x]
 

Output:

(Sqrt[a + b*ArcCosh[c*x]]*((E^((2*a)/b)*Gamma[3/2, a/b + ArcCosh[c*x]])/Sq 
rt[a/b + ArcCosh[c*x]] + Gamma[3/2, -((a + b*ArcCosh[c*x])/b)]/Sqrt[-((a + 
 b*ArcCosh[c*x])/b)]))/(2*c*E^(a/b))
 

Rubi [A] (verified)

Time = 1.23 (sec) , antiderivative size = 104, normalized size of antiderivative = 1.02, number of steps used = 9, number of rules used = 8, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.667, Rules used = {6294, 6368, 3042, 3788, 26, 2611, 2633, 2634}

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.

\(\displaystyle \int \sqrt {a+b \text {arccosh}(c x)} \, dx\)

\(\Big \downarrow \) 6294

\(\displaystyle x \sqrt {a+b \text {arccosh}(c x)}-\frac {1}{2} b c \int \frac {x}{\sqrt {c x-1} \sqrt {c x+1} \sqrt {a+b \text {arccosh}(c x)}}dx\)

\(\Big \downarrow \) 6368

\(\displaystyle x \sqrt {a+b \text {arccosh}(c x)}-\frac {\int \frac {\cosh \left (\frac {a}{b}-\frac {a+b \text {arccosh}(c x)}{b}\right )}{\sqrt {a+b \text {arccosh}(c x)}}d(a+b \text {arccosh}(c x))}{2 c}\)

\(\Big \downarrow \) 3042

\(\displaystyle x \sqrt {a+b \text {arccosh}(c x)}-\frac {\int \frac {\sin \left (\frac {i a}{b}-\frac {i (a+b \text {arccosh}(c x))}{b}+\frac {\pi }{2}\right )}{\sqrt {a+b \text {arccosh}(c x)}}d(a+b \text {arccosh}(c x))}{2 c}\)

\(\Big \downarrow \) 3788

\(\displaystyle x \sqrt {a+b \text {arccosh}(c x)}-\frac {\frac {1}{2} i \int -\frac {i e^{-\text {arccosh}(c x)}}{\sqrt {a+b \text {arccosh}(c x)}}d(a+b \text {arccosh}(c x))-\frac {1}{2} i \int \frac {i e^{\text {arccosh}(c x)}}{\sqrt {a+b \text {arccosh}(c x)}}d(a+b \text {arccosh}(c x))}{2 c}\)

\(\Big \downarrow \) 26

\(\displaystyle x \sqrt {a+b \text {arccosh}(c x)}-\frac {\frac {1}{2} \int \frac {e^{-\text {arccosh}(c x)}}{\sqrt {a+b \text {arccosh}(c x)}}d(a+b \text {arccosh}(c x))+\frac {1}{2} \int \frac {e^{\text {arccosh}(c x)}}{\sqrt {a+b \text {arccosh}(c x)}}d(a+b \text {arccosh}(c x))}{2 c}\)

\(\Big \downarrow \) 2611

\(\displaystyle x \sqrt {a+b \text {arccosh}(c x)}-\frac {\int e^{\frac {a}{b}-\frac {a+b \text {arccosh}(c x)}{b}}d\sqrt {a+b \text {arccosh}(c x)}+\int e^{\frac {a+b \text {arccosh}(c x)}{b}-\frac {a}{b}}d\sqrt {a+b \text {arccosh}(c x)}}{2 c}\)

\(\Big \downarrow \) 2633

\(\displaystyle x \sqrt {a+b \text {arccosh}(c x)}-\frac {\int e^{\frac {a}{b}-\frac {a+b \text {arccosh}(c x)}{b}}d\sqrt {a+b \text {arccosh}(c x)}+\frac {1}{2} \sqrt {\pi } \sqrt {b} e^{-\frac {a}{b}} \text {erfi}\left (\frac {\sqrt {a+b \text {arccosh}(c x)}}{\sqrt {b}}\right )}{2 c}\)

\(\Big \downarrow \) 2634

\(\displaystyle x \sqrt {a+b \text {arccosh}(c x)}-\frac {\frac {1}{2} \sqrt {\pi } \sqrt {b} e^{a/b} \text {erf}\left (\frac {\sqrt {a+b \text {arccosh}(c x)}}{\sqrt {b}}\right )+\frac {1}{2} \sqrt {\pi } \sqrt {b} e^{-\frac {a}{b}} \text {erfi}\left (\frac {\sqrt {a+b \text {arccosh}(c x)}}{\sqrt {b}}\right )}{2 c}\)

Input:

Int[Sqrt[a + b*ArcCosh[c*x]],x]
 

Output:

x*Sqrt[a + b*ArcCosh[c*x]] - ((Sqrt[b]*E^(a/b)*Sqrt[Pi]*Erf[Sqrt[a + b*Arc 
Cosh[c*x]]/Sqrt[b]])/2 + (Sqrt[b]*Sqrt[Pi]*Erfi[Sqrt[a + b*ArcCosh[c*x]]/S 
qrt[b]])/(2*E^(a/b)))/(2*c)
 

Defintions of rubi rules used

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 2611

Int[(F_)^((g_.)*((e_.) + (f_.)*(x_)))/Sqrt[(c_.) + (d_.)*(x_)], x_Symbol] : 
> Simp[2/d   Subst[Int[F^(g*(e - c*(f/d)) + f*g*(x^2/d)), x], x, Sqrt[c + d 
*x]], x] /; FreeQ[{F, c, d, e, f, g}, x] &&  !TrueQ[$UseGamma]
 

rule 2633

Int[(F_)^((a_.) + (b_.)*((c_.) + (d_.)*(x_))^2), x_Symbol] :> Simp[F^a*Sqrt 
[Pi]*(Erfi[(c + d*x)*Rt[b*Log[F], 2]]/(2*d*Rt[b*Log[F], 2])), x] /; FreeQ[{ 
F, a, b, c, d}, x] && PosQ[b]
 

rule 2634

Int[(F_)^((a_.) + (b_.)*((c_.) + (d_.)*(x_))^2), x_Symbol] :> Simp[F^a*Sqrt 
[Pi]*(Erf[(c + d*x)*Rt[(-b)*Log[F], 2]]/(2*d*Rt[(-b)*Log[F], 2])), x] /; Fr 
eeQ[{F, a, b, c, d}, x] && NegQ[b]
 

rule 3042

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

rule 3788

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

rule 6294

Int[((a_.) + ArcCosh[(c_.)*(x_)]*(b_.))^(n_.), x_Symbol] :> Simp[x*(a + b*A 
rcCosh[c*x])^n, x] - Simp[b*c*n   Int[x*((a + b*ArcCosh[c*x])^(n - 1)/(Sqrt 
[1 + c*x]*Sqrt[-1 + c*x])), x], x] /; FreeQ[{a, b, c}, x] && GtQ[n, 0]
 

rule 6368

Int[((a_.) + ArcCosh[(c_.)*(x_)]*(b_.))^(n_.)*(x_)^(m_.)*((d1_) + (e1_.)*(x 
_))^(p_.)*((d2_) + (e2_.)*(x_))^(p_.), x_Symbol] :> Simp[(1/(b*c^(m + 1)))* 
Simp[(d1 + e1*x)^p/(1 + c*x)^p]*Simp[(d2 + e2*x)^p/(-1 + c*x)^p]   Subst[In 
t[x^n*Cosh[-a/b + x/b]^m*Sinh[-a/b + x/b]^(2*p + 1), x], x, a + b*ArcCosh[c 
*x]], x] /; FreeQ[{a, b, c, d1, e1, d2, e2, n}, x] && EqQ[e1, c*d1] && EqQ[ 
e2, (-c)*d2] && IGtQ[p + 3/2, 0] && IGtQ[m, 0]
 

Maple [F]

\[\int \sqrt {a +b \,\operatorname {arccosh}\left (c x \right )}d x\]

Input:

int((a+b*arccosh(c*x))^(1/2),x)
 

Output:

int((a+b*arccosh(c*x))^(1/2),x)
 

Fricas [F(-2)]

Exception generated. \[ \int \sqrt {a+b \text {arccosh}(c x)} \, dx=\text {Exception raised: TypeError} \] Input:

integrate((a+b*arccosh(c*x))^(1/2),x, algorithm="fricas")
 

Output:

Exception raised: TypeError >>  Error detected within library code:   inte 
grate: implementation incomplete (constant residues)
 

Sympy [F]

\[ \int \sqrt {a+b \text {arccosh}(c x)} \, dx=\int \sqrt {a + b \operatorname {acosh}{\left (c x \right )}}\, dx \] Input:

integrate((a+b*acosh(c*x))**(1/2),x)
 

Output:

Integral(sqrt(a + b*acosh(c*x)), x)
 

Maxima [F]

\[ \int \sqrt {a+b \text {arccosh}(c x)} \, dx=\int { \sqrt {b \operatorname {arcosh}\left (c x\right ) + a} \,d x } \] Input:

integrate((a+b*arccosh(c*x))^(1/2),x, algorithm="maxima")
 

Output:

integrate(sqrt(b*arccosh(c*x) + a), x)
                                                                                    
                                                                                    
 

Giac [F]

\[ \int \sqrt {a+b \text {arccosh}(c x)} \, dx=\int { \sqrt {b \operatorname {arcosh}\left (c x\right ) + a} \,d x } \] Input:

integrate((a+b*arccosh(c*x))^(1/2),x, algorithm="giac")
 

Output:

integrate(sqrt(b*arccosh(c*x) + a), x)
 

Mupad [F(-1)]

Timed out. \[ \int \sqrt {a+b \text {arccosh}(c x)} \, dx=\int \sqrt {a+b\,\mathrm {acosh}\left (c\,x\right )} \,d x \] Input:

int((a + b*acosh(c*x))^(1/2),x)
 

Output:

int((a + b*acosh(c*x))^(1/2), x)
 

Reduce [F]

\[ \int \sqrt {a+b \text {arccosh}(c x)} \, dx=\int \sqrt {\mathit {acosh} \left (c x \right ) b +a}d x \] Input:

int((a+b*acosh(c*x))^(1/2),x)
 

Output:

int(sqrt(acosh(c*x)*b + a),x)