Integrand size = 15, antiderivative size = 95 \[ \int \frac {\sqrt {a+b x^2}}{x^7} \, dx=-\frac {\sqrt {a+b x^2}}{6 x^6}-\frac {b \sqrt {a+b x^2}}{24 a x^4}+\frac {b^2 \sqrt {a+b x^2}}{16 a^2 x^2}-\frac {b^3 \text {arctanh}\left (\frac {\sqrt {a+b x^2}}{\sqrt {a}}\right )}{16 a^{5/2}} \] Output:
-1/6*(b*x^2+a)^(1/2)/x^6-1/24*b*(b*x^2+a)^(1/2)/a/x^4+1/16*b^2*(b*x^2+a)^( 1/2)/a^2/x^2-1/16*b^3*arctanh((b*x^2+a)^(1/2)/a^(1/2))/a^(5/2)
Time = 0.10 (sec) , antiderivative size = 73, normalized size of antiderivative = 0.77 \[ \int \frac {\sqrt {a+b x^2}}{x^7} \, dx=\frac {\sqrt {a+b x^2} \left (-8 a^2-2 a b x^2+3 b^2 x^4\right )}{48 a^2 x^6}-\frac {b^3 \text {arctanh}\left (\frac {\sqrt {a+b x^2}}{\sqrt {a}}\right )}{16 a^{5/2}} \] Input:
Integrate[Sqrt[a + b*x^2]/x^7,x]
Output:
(Sqrt[a + b*x^2]*(-8*a^2 - 2*a*b*x^2 + 3*b^2*x^4))/(48*a^2*x^6) - (b^3*Arc Tanh[Sqrt[a + b*x^2]/Sqrt[a]])/(16*a^(5/2))
Time = 0.19 (sec) , antiderivative size = 103, normalized size of antiderivative = 1.08, number of steps used = 7, number of rules used = 6, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.400, Rules used = {243, 51, 52, 52, 73, 221}
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.
\(\displaystyle \int \frac {\sqrt {a+b x^2}}{x^7} \, dx\) |
\(\Big \downarrow \) 243 |
\(\displaystyle \frac {1}{2} \int \frac {\sqrt {b x^2+a}}{x^8}dx^2\) |
\(\Big \downarrow \) 51 |
\(\displaystyle \frac {1}{2} \left (\frac {1}{6} b \int \frac {1}{x^6 \sqrt {b x^2+a}}dx^2-\frac {\sqrt {a+b x^2}}{3 x^6}\right )\) |
\(\Big \downarrow \) 52 |
\(\displaystyle \frac {1}{2} \left (\frac {1}{6} b \left (-\frac {3 b \int \frac {1}{x^4 \sqrt {b x^2+a}}dx^2}{4 a}-\frac {\sqrt {a+b x^2}}{2 a x^4}\right )-\frac {\sqrt {a+b x^2}}{3 x^6}\right )\) |
\(\Big \downarrow \) 52 |
\(\displaystyle \frac {1}{2} \left (\frac {1}{6} b \left (-\frac {3 b \left (-\frac {b \int \frac {1}{x^2 \sqrt {b x^2+a}}dx^2}{2 a}-\frac {\sqrt {a+b x^2}}{a x^2}\right )}{4 a}-\frac {\sqrt {a+b x^2}}{2 a x^4}\right )-\frac {\sqrt {a+b x^2}}{3 x^6}\right )\) |
\(\Big \downarrow \) 73 |
\(\displaystyle \frac {1}{2} \left (\frac {1}{6} b \left (-\frac {3 b \left (-\frac {\int \frac {1}{\frac {x^4}{b}-\frac {a}{b}}d\sqrt {b x^2+a}}{a}-\frac {\sqrt {a+b x^2}}{a x^2}\right )}{4 a}-\frac {\sqrt {a+b x^2}}{2 a x^4}\right )-\frac {\sqrt {a+b x^2}}{3 x^6}\right )\) |
\(\Big \downarrow \) 221 |
\(\displaystyle \frac {1}{2} \left (\frac {1}{6} b \left (-\frac {3 b \left (\frac {b \text {arctanh}\left (\frac {\sqrt {a+b x^2}}{\sqrt {a}}\right )}{a^{3/2}}-\frac {\sqrt {a+b x^2}}{a x^2}\right )}{4 a}-\frac {\sqrt {a+b x^2}}{2 a x^4}\right )-\frac {\sqrt {a+b x^2}}{3 x^6}\right )\) |
Input:
Int[Sqrt[a + b*x^2]/x^7,x]
Output:
(-1/3*Sqrt[a + b*x^2]/x^6 + (b*(-1/2*Sqrt[a + b*x^2]/(a*x^4) - (3*b*(-(Sqr t[a + b*x^2]/(a*x^2)) + (b*ArcTanh[Sqrt[a + b*x^2]/Sqrt[a]])/a^(3/2)))/(4* a)))/6)/2
Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> Simp[ (a + b*x)^(m + 1)*((c + d*x)^n/(b*(m + 1))), x] - Simp[d*(n/(b*(m + 1))) Int[(a + b*x)^(m + 1)*(c + d*x)^(n - 1), x], x] /; FreeQ[{a, b, c, d, n}, x ] && ILtQ[m, -1] && FractionQ[n] && GtQ[n, 0]
Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> Simp[ (a + b*x)^(m + 1)*((c + d*x)^(n + 1)/((b*c - a*d)*(m + 1))), x] - Simp[d*(( m + n + 2)/((b*c - a*d)*(m + 1))) Int[(a + b*x)^(m + 1)*(c + d*x)^n, x], x] /; FreeQ[{a, b, c, d, n}, x] && ILtQ[m, -1] && FractionQ[n] && LtQ[n, 0]
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]
Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(Rt[-a/b, 2]/a)*ArcTanh[x /Rt[-a/b, 2]], x] /; FreeQ[{a, b}, x] && NegQ[a/b]
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]
Time = 0.30 (sec) , antiderivative size = 71, normalized size of antiderivative = 0.75
method | result | size |
risch | \(-\frac {\sqrt {b \,x^{2}+a}\, \left (-3 b^{2} x^{4}+2 a b \,x^{2}+8 a^{2}\right )}{48 x^{6} a^{2}}-\frac {b^{3} \ln \left (\frac {2 a +2 \sqrt {a}\, \sqrt {b \,x^{2}+a}}{x}\right )}{16 a^{\frac {5}{2}}}\) | \(71\) |
pseudoelliptic | \(\frac {-3 \,\operatorname {arctanh}\left (\frac {\sqrt {b \,x^{2}+a}}{\sqrt {a}}\right ) b^{3} x^{6}+3 b^{2} x^{4} \sqrt {b \,x^{2}+a}\, \sqrt {a}-2 a^{\frac {3}{2}} b \,x^{2} \sqrt {b \,x^{2}+a}-8 a^{\frac {5}{2}} \sqrt {b \,x^{2}+a}}{48 a^{\frac {5}{2}} x^{6}}\) | \(84\) |
default | \(-\frac {\left (b \,x^{2}+a \right )^{\frac {3}{2}}}{6 a \,x^{6}}-\frac {b \left (-\frac {\left (b \,x^{2}+a \right )^{\frac {3}{2}}}{4 a \,x^{4}}-\frac {b \left (-\frac {\left (b \,x^{2}+a \right )^{\frac {3}{2}}}{2 a \,x^{2}}+\frac {b \left (\sqrt {b \,x^{2}+a}-\sqrt {a}\, \ln \left (\frac {2 a +2 \sqrt {a}\, \sqrt {b \,x^{2}+a}}{x}\right )\right )}{2 a}\right )}{4 a}\right )}{2 a}\) | \(111\) |
Input:
int((b*x^2+a)^(1/2)/x^7,x,method=_RETURNVERBOSE)
Output:
-1/48*(b*x^2+a)^(1/2)*(-3*b^2*x^4+2*a*b*x^2+8*a^2)/x^6/a^2-1/16/a^(5/2)*b^ 3*ln((2*a+2*a^(1/2)*(b*x^2+a)^(1/2))/x)
Time = 0.08 (sec) , antiderivative size = 160, normalized size of antiderivative = 1.68 \[ \int \frac {\sqrt {a+b x^2}}{x^7} \, dx=\left [\frac {3 \, \sqrt {a} b^{3} x^{6} \log \left (-\frac {b x^{2} - 2 \, \sqrt {b x^{2} + a} \sqrt {a} + 2 \, a}{x^{2}}\right ) + 2 \, {\left (3 \, a b^{2} x^{4} - 2 \, a^{2} b x^{2} - 8 \, a^{3}\right )} \sqrt {b x^{2} + a}}{96 \, a^{3} x^{6}}, \frac {3 \, \sqrt {-a} b^{3} x^{6} \arctan \left (\frac {\sqrt {b x^{2} + a} \sqrt {-a}}{a}\right ) + {\left (3 \, a b^{2} x^{4} - 2 \, a^{2} b x^{2} - 8 \, a^{3}\right )} \sqrt {b x^{2} + a}}{48 \, a^{3} x^{6}}\right ] \] Input:
integrate((b*x^2+a)^(1/2)/x^7,x, algorithm="fricas")
Output:
[1/96*(3*sqrt(a)*b^3*x^6*log(-(b*x^2 - 2*sqrt(b*x^2 + a)*sqrt(a) + 2*a)/x^ 2) + 2*(3*a*b^2*x^4 - 2*a^2*b*x^2 - 8*a^3)*sqrt(b*x^2 + a))/(a^3*x^6), 1/4 8*(3*sqrt(-a)*b^3*x^6*arctan(sqrt(b*x^2 + a)*sqrt(-a)/a) + (3*a*b^2*x^4 - 2*a^2*b*x^2 - 8*a^3)*sqrt(b*x^2 + a))/(a^3*x^6)]
Time = 4.64 (sec) , antiderivative size = 117, normalized size of antiderivative = 1.23 \[ \int \frac {\sqrt {a+b x^2}}{x^7} \, dx=- \frac {a}{6 \sqrt {b} x^{7} \sqrt {\frac {a}{b x^{2}} + 1}} - \frac {5 \sqrt {b}}{24 x^{5} \sqrt {\frac {a}{b x^{2}} + 1}} + \frac {b^{\frac {3}{2}}}{48 a x^{3} \sqrt {\frac {a}{b x^{2}} + 1}} + \frac {b^{\frac {5}{2}}}{16 a^{2} x \sqrt {\frac {a}{b x^{2}} + 1}} - \frac {b^{3} \operatorname {asinh}{\left (\frac {\sqrt {a}}{\sqrt {b} x} \right )}}{16 a^{\frac {5}{2}}} \] Input:
integrate((b*x**2+a)**(1/2)/x**7,x)
Output:
-a/(6*sqrt(b)*x**7*sqrt(a/(b*x**2) + 1)) - 5*sqrt(b)/(24*x**5*sqrt(a/(b*x* *2) + 1)) + b**(3/2)/(48*a*x**3*sqrt(a/(b*x**2) + 1)) + b**(5/2)/(16*a**2* x*sqrt(a/(b*x**2) + 1)) - b**3*asinh(sqrt(a)/(sqrt(b)*x))/(16*a**(5/2))
Time = 0.04 (sec) , antiderivative size = 93, normalized size of antiderivative = 0.98 \[ \int \frac {\sqrt {a+b x^2}}{x^7} \, dx=-\frac {b^{3} \operatorname {arsinh}\left (\frac {a}{\sqrt {a b} {\left | x \right |}}\right )}{16 \, a^{\frac {5}{2}}} + \frac {\sqrt {b x^{2} + a} b^{3}}{16 \, a^{3}} - \frac {{\left (b x^{2} + a\right )}^{\frac {3}{2}} b^{2}}{16 \, a^{3} x^{2}} + \frac {{\left (b x^{2} + a\right )}^{\frac {3}{2}} b}{8 \, a^{2} x^{4}} - \frac {{\left (b x^{2} + a\right )}^{\frac {3}{2}}}{6 \, a x^{6}} \] Input:
integrate((b*x^2+a)^(1/2)/x^7,x, algorithm="maxima")
Output:
-1/16*b^3*arcsinh(a/(sqrt(a*b)*abs(x)))/a^(5/2) + 1/16*sqrt(b*x^2 + a)*b^3 /a^3 - 1/16*(b*x^2 + a)^(3/2)*b^2/(a^3*x^2) + 1/8*(b*x^2 + a)^(3/2)*b/(a^2 *x^4) - 1/6*(b*x^2 + a)^(3/2)/(a*x^6)
Time = 0.13 (sec) , antiderivative size = 80, normalized size of antiderivative = 0.84 \[ \int \frac {\sqrt {a+b x^2}}{x^7} \, dx=\frac {1}{48} \, b^{3} {\left (\frac {3 \, \arctan \left (\frac {\sqrt {b x^{2} + a}}{\sqrt {-a}}\right )}{\sqrt {-a} a^{2}} + \frac {3 \, {\left (b x^{2} + a\right )}^{\frac {5}{2}} - 8 \, {\left (b x^{2} + a\right )}^{\frac {3}{2}} a - 3 \, \sqrt {b x^{2} + a} a^{2}}{a^{2} b^{3} x^{6}}\right )} \] Input:
integrate((b*x^2+a)^(1/2)/x^7,x, algorithm="giac")
Output:
1/48*b^3*(3*arctan(sqrt(b*x^2 + a)/sqrt(-a))/(sqrt(-a)*a^2) + (3*(b*x^2 + a)^(5/2) - 8*(b*x^2 + a)^(3/2)*a - 3*sqrt(b*x^2 + a)*a^2)/(a^2*b^3*x^6))
Time = 0.60 (sec) , antiderivative size = 74, normalized size of antiderivative = 0.78 \[ \int \frac {\sqrt {a+b x^2}}{x^7} \, dx=\frac {{\left (b\,x^2+a\right )}^{5/2}}{16\,a^2\,x^6}-\frac {{\left (b\,x^2+a\right )}^{3/2}}{6\,a\,x^6}-\frac {\sqrt {b\,x^2+a}}{16\,x^6}+\frac {b^3\,\mathrm {atan}\left (\frac {\sqrt {b\,x^2+a}\,1{}\mathrm {i}}{\sqrt {a}}\right )\,1{}\mathrm {i}}{16\,a^{5/2}} \] Input:
int((a + b*x^2)^(1/2)/x^7,x)
Output:
(b^3*atan(((a + b*x^2)^(1/2)*1i)/a^(1/2))*1i)/(16*a^(5/2)) - (a + b*x^2)^( 1/2)/(16*x^6) - (a + b*x^2)^(3/2)/(6*a*x^6) + (a + b*x^2)^(5/2)/(16*a^2*x^ 6)
Time = 0.25 (sec) , antiderivative size = 120, normalized size of antiderivative = 1.26 \[ \int \frac {\sqrt {a+b x^2}}{x^7} \, dx=\frac {-8 \sqrt {b \,x^{2}+a}\, a^{3}-2 \sqrt {b \,x^{2}+a}\, a^{2} b \,x^{2}+3 \sqrt {b \,x^{2}+a}\, a \,b^{2} x^{4}+3 \sqrt {a}\, \mathrm {log}\left (\frac {\sqrt {b \,x^{2}+a}-\sqrt {a}+\sqrt {b}\, x}{\sqrt {a}}\right ) b^{3} x^{6}-3 \sqrt {a}\, \mathrm {log}\left (\frac {\sqrt {b \,x^{2}+a}+\sqrt {a}+\sqrt {b}\, x}{\sqrt {a}}\right ) b^{3} x^{6}}{48 a^{3} x^{6}} \] Input:
int((b*x^2+a)^(1/2)/x^7,x)
Output:
( - 8*sqrt(a + b*x**2)*a**3 - 2*sqrt(a + b*x**2)*a**2*b*x**2 + 3*sqrt(a + b*x**2)*a*b**2*x**4 + 3*sqrt(a)*log((sqrt(a + b*x**2) - sqrt(a) + sqrt(b)* x)/sqrt(a))*b**3*x**6 - 3*sqrt(a)*log((sqrt(a + b*x**2) + sqrt(a) + sqrt(b )*x)/sqrt(a))*b**3*x**6)/(48*a**3*x**6)