Integrand size = 23, antiderivative size = 217 \[ \int \coth ^3(c+d x) \sqrt {a+b \text {sech}(c+d x)} \, dx=\frac {2 \sqrt {a} \text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a}}\right )}{d}-\frac {a \text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a-b}}\right )}{\sqrt {a-b} d}+\frac {3 b \text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a-b}}\right )}{4 \sqrt {a-b} d}-\frac {a \text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a+b}}\right )}{\sqrt {a+b} d}-\frac {3 b \text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a+b}}\right )}{4 \sqrt {a+b} d}-\frac {\coth ^2(c+d x) \sqrt {a+b \text {sech}(c+d x)}}{2 d} \]
2*arctanh((a+b*sech(d*x+c))^(1/2)/a^(1/2))*a^(1/2)/d-a*arctanh((a+b*sech(d *x+c))^(1/2)/(a-b)^(1/2))/d/(a-b)^(1/2)+3/4*b*arctanh((a+b*sech(d*x+c))^(1 /2)/(a-b)^(1/2))/d/(a-b)^(1/2)-a*arctanh((a+b*sech(d*x+c))^(1/2)/(a+b)^(1/ 2))/d/(a+b)^(1/2)-3/4*b*arctanh((a+b*sech(d*x+c))^(1/2)/(a+b)^(1/2))/d/(a+ b)^(1/2)-1/2*coth(d*x+c)^2*(a+b*sech(d*x+c))^(1/2)/d
Time = 4.09 (sec) , antiderivative size = 223, normalized size of antiderivative = 1.03 \[ \int \coth ^3(c+d x) \sqrt {a+b \text {sech}(c+d x)} \, dx=\frac {\frac {b \arctan \left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {-a+b}}\right )}{\sqrt {-a+b}}+8 \sqrt {a} \text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a}}\right )-4 \sqrt {a-b} \text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a-b}}\right )+\frac {b \text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a+b}}\right )}{\sqrt {a+b}}-4 \sqrt {a+b} \text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a+b}}\right )+\frac {\sqrt {a+b \text {sech}(c+d x)}}{-1+\text {sech}(c+d x)}-\frac {\sqrt {a+b \text {sech}(c+d x)}}{1+\text {sech}(c+d x)}}{4 d} \]
((b*ArcTan[Sqrt[a + b*Sech[c + d*x]]/Sqrt[-a + b]])/Sqrt[-a + b] + 8*Sqrt[ a]*ArcTanh[Sqrt[a + b*Sech[c + d*x]]/Sqrt[a]] - 4*Sqrt[a - b]*ArcTanh[Sqrt [a + b*Sech[c + d*x]]/Sqrt[a - b]] + (b*ArcTanh[Sqrt[a + b*Sech[c + d*x]]/ Sqrt[a + b]])/Sqrt[a + b] - 4*Sqrt[a + b]*ArcTanh[Sqrt[a + b*Sech[c + d*x] ]/Sqrt[a + b]] + Sqrt[a + b*Sech[c + d*x]]/(-1 + Sech[c + d*x]) - Sqrt[a + b*Sech[c + d*x]]/(1 + Sech[c + d*x]))/(4*d)
Time = 0.58 (sec) , antiderivative size = 268, normalized size of antiderivative = 1.24, number of steps used = 14, number of rules used = 13, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.565, Rules used = {3042, 26, 4373, 561, 25, 1652, 25, 1484, 1492, 27, 1406, 220, 2009}
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.
| \(\displaystyle \int \coth ^3(c+d x) \sqrt {a+b \text {sech}(c+d x)} \, dx\) |
| \(\Big \downarrow \) 3042 |
| \(\displaystyle \int \frac {i \sqrt {a+b \csc \left (i c+i d x+\frac {\pi }{2}\right )}}{\cot \left (i c+i d x+\frac {\pi }{2}\right )^3}dx\) |
| \(\Big \downarrow \) 26 |
| \(\displaystyle i \int \frac {\sqrt {a+b \csc \left (\frac {1}{2} (2 i c+\pi )+i d x\right )}}{\cot \left (\frac {1}{2} (2 i c+\pi )+i d x\right )^3}dx\) |
| \(\Big \downarrow \) 4373 |
| \(\displaystyle -\frac {b^4 \int \frac {\cosh (c+d x) \sqrt {a+b \text {sech}(c+d x)}}{b \left (b^2-b^2 \text {sech}^2(c+d x)\right )^2}d(b \text {sech}(c+d x))}{d}\) |
| \(\Big \downarrow \) 561 |
| \(\displaystyle -\frac {2 b^4 \int -\frac {b^2 \text {sech}^2(c+d x)}{\left (a-b^2 \text {sech}^2(c+d x)\right ) \left (b^4 \text {sech}^4(c+d x)-2 a b^2 \text {sech}^2(c+d x)+a^2-b^2\right )^2}d\sqrt {a+b \text {sech}(c+d x)}}{d}\) |
| \(\Big \downarrow \) 25 |
| \(\displaystyle \frac {2 b^4 \int \frac {b^2 \text {sech}^2(c+d x)}{\left (a-b^2 \text {sech}^2(c+d x)\right ) \left (b^4 \text {sech}^4(c+d x)-2 a b^2 \text {sech}^2(c+d x)+a^2-b^2\right )^2}d\sqrt {a+b \text {sech}(c+d x)}}{d}\) |
| \(\Big \downarrow \) 1652 |
| \(\displaystyle -\frac {2 b^4 \left (\frac {\int -\frac {a^2-b^2 \text {sech}^2(c+d x) a-b^2}{\left (b^4 \text {sech}^4(c+d x)-2 a b^2 \text {sech}^2(c+d x)+a^2-b^2\right )^2}d\sqrt {a+b \text {sech}(c+d x)}}{b^2}+\frac {a \int \frac {1}{\left (a-b^2 \text {sech}^2(c+d x)\right ) \left (b^4 \text {sech}^4(c+d x)-2 a b^2 \text {sech}^2(c+d x)+a^2-b^2\right )}d\sqrt {a+b \text {sech}(c+d x)}}{b^2}\right )}{d}\) |
| \(\Big \downarrow \) 25 |
| \(\displaystyle -\frac {2 b^4 \left (\frac {a \int \frac {1}{\left (a-b^2 \text {sech}^2(c+d x)\right ) \left (b^4 \text {sech}^4(c+d x)-2 a b^2 \text {sech}^2(c+d x)+a^2-b^2\right )}d\sqrt {a+b \text {sech}(c+d x)}}{b^2}-\frac {\int \frac {a^2-b^2 \text {sech}^2(c+d x) a-b^2}{\left (b^4 \text {sech}^4(c+d x)-2 a b^2 \text {sech}^2(c+d x)+a^2-b^2\right )^2}d\sqrt {a+b \text {sech}(c+d x)}}{b^2}\right )}{d}\) |
| \(\Big \downarrow \) 1484 |
| \(\displaystyle -\frac {2 b^4 \left (\frac {a \int \left (\frac {1}{2 b^2 \left (-b^2 \text {sech}^2(c+d x)+a+b\right )}-\frac {1}{2 b^2 \left (b^2 \text {sech}^2(c+d x)-a+b\right )}-\frac {1}{b^2 \left (a-b^2 \text {sech}^2(c+d x)\right )}\right )d\sqrt {a+b \text {sech}(c+d x)}}{b^2}-\frac {\int \frac {a^2-b^2 \text {sech}^2(c+d x) a-b^2}{\left (b^4 \text {sech}^4(c+d x)-2 a b^2 \text {sech}^2(c+d x)+a^2-b^2\right )^2}d\sqrt {a+b \text {sech}(c+d x)}}{b^2}\right )}{d}\) |
| \(\Big \downarrow \) 1492 |
| \(\displaystyle -\frac {2 b^4 \left (\frac {a \int \left (\frac {1}{2 b^2 \left (-b^2 \text {sech}^2(c+d x)+a+b\right )}-\frac {1}{2 b^2 \left (b^2 \text {sech}^2(c+d x)-a+b\right )}-\frac {1}{b^2 \left (a-b^2 \text {sech}^2(c+d x)\right )}\right )d\sqrt {a+b \text {sech}(c+d x)}}{b^2}-\frac {\frac {\sqrt {a+b \text {sech}(c+d x)}}{4 \left (a^2-2 a b^2 \text {sech}^2(c+d x)+b^4 \text {sech}^4(c+d x)-b^2\right )}-\frac {\int -\frac {6 b^2 \left (a^2-b^2\right )}{b^4 \text {sech}^4(c+d x)-2 a b^2 \text {sech}^2(c+d x)+a^2-b^2}d\sqrt {a+b \text {sech}(c+d x)}}{8 b^2 \left (a^2-b^2\right )}}{b^2}\right )}{d}\) |
| \(\Big \downarrow \) 27 |
| \(\displaystyle -\frac {2 b^4 \left (\frac {a \int \left (\frac {1}{2 b^2 \left (-b^2 \text {sech}^2(c+d x)+a+b\right )}-\frac {1}{2 b^2 \left (b^2 \text {sech}^2(c+d x)-a+b\right )}-\frac {1}{b^2 \left (a-b^2 \text {sech}^2(c+d x)\right )}\right )d\sqrt {a+b \text {sech}(c+d x)}}{b^2}-\frac {\frac {3}{4} \int \frac {1}{b^4 \text {sech}^4(c+d x)-2 a b^2 \text {sech}^2(c+d x)+a^2-b^2}d\sqrt {a+b \text {sech}(c+d x)}+\frac {\sqrt {a+b \text {sech}(c+d x)}}{4 \left (a^2-2 a b^2 \text {sech}^2(c+d x)+b^4 \text {sech}^4(c+d x)-b^2\right )}}{b^2}\right )}{d}\) |
| \(\Big \downarrow \) 1406 |
| \(\displaystyle -\frac {2 b^4 \left (\frac {a \int \left (\frac {1}{2 b^2 \left (-b^2 \text {sech}^2(c+d x)+a+b\right )}-\frac {1}{2 b^2 \left (b^2 \text {sech}^2(c+d x)-a+b\right )}-\frac {1}{b^2 \left (a-b^2 \text {sech}^2(c+d x)\right )}\right )d\sqrt {a+b \text {sech}(c+d x)}}{b^2}-\frac {\frac {3}{4} \left (\frac {\int \frac {1}{b^2 \text {sech}^2(c+d x)-a-b}d\sqrt {a+b \text {sech}(c+d x)}}{2 b}-\frac {\int \frac {1}{b^2 \text {sech}^2(c+d x)-a+b}d\sqrt {a+b \text {sech}(c+d x)}}{2 b}\right )+\frac {\sqrt {a+b \text {sech}(c+d x)}}{4 \left (a^2-2 a b^2 \text {sech}^2(c+d x)+b^4 \text {sech}^4(c+d x)-b^2\right )}}{b^2}\right )}{d}\) |
| \(\Big \downarrow \) 220 |
| \(\displaystyle -\frac {2 b^4 \left (\frac {a \int \left (\frac {1}{2 b^2 \left (-b^2 \text {sech}^2(c+d x)+a+b\right )}-\frac {1}{2 b^2 \left (b^2 \text {sech}^2(c+d x)-a+b\right )}-\frac {1}{b^2 \left (a-b^2 \text {sech}^2(c+d x)\right )}\right )d\sqrt {a+b \text {sech}(c+d x)}}{b^2}-\frac {\frac {\sqrt {a+b \text {sech}(c+d x)}}{4 \left (a^2-2 a b^2 \text {sech}^2(c+d x)+b^4 \text {sech}^4(c+d x)-b^2\right )}+\frac {3}{4} \left (\frac {\text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a-b}}\right )}{2 b \sqrt {a-b}}-\frac {\text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a+b}}\right )}{2 b \sqrt {a+b}}\right )}{b^2}\right )}{d}\) |
| \(\Big \downarrow \) 2009 |
| \(\displaystyle -\frac {2 b^4 \left (\frac {a \left (-\frac {\text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a}}\right )}{\sqrt {a} b^2}+\frac {\text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a-b}}\right )}{2 b^2 \sqrt {a-b}}+\frac {\text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a+b}}\right )}{2 b^2 \sqrt {a+b}}\right )}{b^2}-\frac {\frac {\sqrt {a+b \text {sech}(c+d x)}}{4 \left (a^2-2 a b^2 \text {sech}^2(c+d x)+b^4 \text {sech}^4(c+d x)-b^2\right )}+\frac {3}{4} \left (\frac {\text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a-b}}\right )}{2 b \sqrt {a-b}}-\frac {\text {arctanh}\left (\frac {\sqrt {a+b \text {sech}(c+d x)}}{\sqrt {a+b}}\right )}{2 b \sqrt {a+b}}\right )}{b^2}\right )}{d}\) |
(-2*b^4*((a*(-(ArcTanh[Sqrt[a + b*Sech[c + d*x]]/Sqrt[a]]/(Sqrt[a]*b^2)) + ArcTanh[Sqrt[a + b*Sech[c + d*x]]/Sqrt[a - b]]/(2*Sqrt[a - b]*b^2) + ArcT anh[Sqrt[a + b*Sech[c + d*x]]/Sqrt[a + b]]/(2*b^2*Sqrt[a + b])))/b^2 - ((3 *(ArcTanh[Sqrt[a + b*Sech[c + d*x]]/Sqrt[a - b]]/(2*Sqrt[a - b]*b) - ArcTa nh[Sqrt[a + b*Sech[c + d*x]]/Sqrt[a + b]]/(2*b*Sqrt[a + b])))/4 + Sqrt[a + b*Sech[c + d*x]]/(4*(a^2 - b^2 - 2*a*b^2*Sech[c + d*x]^2 + b^4*Sech[c + d *x]^4)))/b^2))/d
3.2.29.3.1 Defintions of rubi rules used
Int[(Complex[0, a_])*(Fx_), x_Symbol] :> Simp[(Complex[Identity[0], a]) I nt[Fx, x], x] /; FreeQ[a, x] && EqQ[a^2, 1]
Int[(a_)*(Fx_), x_Symbol] :> Simp[a Int[Fx, x], x] /; FreeQ[a, x] && !Ma tchQ[Fx, (b_)*(Gx_) /; FreeQ[b, x]]
Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(-(Rt[-a, 2]*Rt[b, 2])^(- 1))*ArcTanh[Rt[b, 2]*(x/Rt[-a, 2])], x] /; FreeQ[{a, b}, x] && NegQ[a/b] && (LtQ[a, 0] || GtQ[b, 0])
Int[(x_)^(m_.)*((c_) + (d_.)*(x_))^(n_)*((a_) + (b_.)*(x_)^2)^(p_), x_Symbo l] :> With[{k = Denominator[n]}, Simp[k/d Subst[Int[x^(k*(n + 1) - 1)*(-c /d + x^k/d)^m*Simp[(b*c^2 + a*d^2)/d^2 - 2*b*c*(x^k/d^2) + b*(x^(2*k)/d^2), x]^p, x], x, (c + d*x)^(1/k)], x]] /; FreeQ[{a, b, c, d, m, p}, x] && Frac tionQ[n] && IntegerQ[p] && IntegerQ[m]
Int[((a_) + (b_.)*(x_)^2 + (c_.)*(x_)^4)^(-1), x_Symbol] :> With[{q = Rt[b^ 2 - 4*a*c, 2]}, Simp[c/q Int[1/(b/2 - q/2 + c*x^2), x], x] - Simp[c/q I nt[1/(b/2 + q/2 + c*x^2), x], x]] /; FreeQ[{a, b, c}, x] && NeQ[b^2 - 4*a*c , 0] && PosQ[b^2 - 4*a*c]
Int[((d_) + (e_.)*(x_)^2)^(q_)/((a_) + (b_.)*(x_)^2 + (c_.)*(x_)^4), x_Symb ol] :> Int[ExpandIntegrand[(d + e*x^2)^q/(a + b*x^2 + c*x^4), x], x] /; Fre eQ[{a, b, c, d, e}, x] && NeQ[b^2 - 4*a*c, 0] && NeQ[c*d^2 - b*d*e + a*e^2, 0] && IntegerQ[q]
Int[((d_) + (e_.)*(x_)^2)*((a_) + (b_.)*(x_)^2 + (c_.)*(x_)^4)^(p_), x_Symb ol] :> Simp[x*(a*b*e - d*(b^2 - 2*a*c) - c*(b*d - 2*a*e)*x^2)*((a + b*x^2 + c*x^4)^(p + 1)/(2*a*(p + 1)*(b^2 - 4*a*c))), x] + Simp[1/(2*a*(p + 1)*(b^2 - 4*a*c)) Int[Simp[(2*p + 3)*d*b^2 - a*b*e - 2*a*c*d*(4*p + 5) + (4*p + 7)*(d*b - 2*a*e)*c*x^2, x]*(a + b*x^2 + c*x^4)^(p + 1), x], x] /; FreeQ[{a, b, c, d, e}, x] && NeQ[b^2 - 4*a*c, 0] && NeQ[c*d^2 - b*d*e + a*e^2, 0] && LtQ[p, -1] && IntegerQ[2*p]
Int[(((f_.)*(x_))^(m_.)*((a_.) + (b_.)*(x_)^2 + (c_.)*(x_)^4)^(p_))/((d_) + (e_.)*(x_)^2), x_Symbol] :> Simp[f^2/(c*d^2 - b*d*e + a*e^2) Int[(f*x)^( m - 2)*(a*e + c*d*x^2)*(a + b*x^2 + c*x^4)^p, x], x] - Simp[d*e*(f^2/(c*d^2 - b*d*e + a*e^2)) Int[(f*x)^(m - 2)*((a + b*x^2 + c*x^4)^(p + 1)/(d + e* x^2)), x], x] /; FreeQ[{a, b, c, d, e, f}, x] && NeQ[b^2 - 4*a*c, 0] && LtQ [p, -1] && GtQ[m, 0]
Int[cot[(c_.) + (d_.)*(x_)]^(m_.)*(csc[(c_.) + (d_.)*(x_)]*(b_.) + (a_))^(n _), x_Symbol] :> Simp[-(-1)^((m - 1)/2)/(d*b^(m - 1)) Subst[Int[(b^2 - x^ 2)^((m - 1)/2)*((a + x)^n/x), x], x, b*Csc[c + d*x]], x] /; FreeQ[{a, b, c, d, n}, x] && IntegerQ[(m - 1)/2] && NeQ[a^2 - b^2, 0]
\[\int \coth \left (d x +c \right )^{3} \sqrt {a +b \,\operatorname {sech}\left (d x +c \right )}d x\]
Leaf count of result is larger than twice the leaf count of optimal. 1399 vs. \(2 (179) = 358\).
Time = 0.99 (sec) , antiderivative size = 16532, normalized size of antiderivative = 76.18 \[ \int \coth ^3(c+d x) \sqrt {a+b \text {sech}(c+d x)} \, dx=\text {Too large to display} \]
\[ \int \coth ^3(c+d x) \sqrt {a+b \text {sech}(c+d x)} \, dx=\int \sqrt {a + b \operatorname {sech}{\left (c + d x \right )}} \coth ^{3}{\left (c + d x \right )}\, dx \]
\[ \int \coth ^3(c+d x) \sqrt {a+b \text {sech}(c+d x)} \, dx=\int { \sqrt {b \operatorname {sech}\left (d x + c\right ) + a} \coth \left (d x + c\right )^{3} \,d x } \]
\[ \int \coth ^3(c+d x) \sqrt {a+b \text {sech}(c+d x)} \, dx=\int { \sqrt {b \operatorname {sech}\left (d x + c\right ) + a} \coth \left (d x + c\right )^{3} \,d x } \]
Timed out. \[ \int \coth ^3(c+d x) \sqrt {a+b \text {sech}(c+d x)} \, dx=\int {\mathrm {coth}\left (c+d\,x\right )}^3\,\sqrt {a+\frac {b}{\mathrm {cosh}\left (c+d\,x\right )}} \,d x \]