3.16.25 \(\int \frac {1}{\sqrt {b x} \sqrt {4+b x}} \, dx\) [1525]

Optimal. Leaf size=17 \[ \frac {2 \sinh ^{-1}\left (\frac {\sqrt {b x}}{2}\right )}{b} \]

[Out]

2*arcsinh(1/2*(b*x)^(1/2))/b

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Rubi [A]
time = 0.00, antiderivative size = 17, normalized size of antiderivative = 1.00, number of steps used = 2, number of rules used = 2, integrand size = 17, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.118, Rules used = {65, 221} \begin {gather*} \frac {2 \sinh ^{-1}\left (\frac {\sqrt {b x}}{2}\right )}{b} \end {gather*}

Antiderivative was successfully verified.

[In]

Int[1/(Sqrt[b*x]*Sqrt[4 + b*x]),x]

[Out]

(2*ArcSinh[Sqrt[b*x]/2])/b

Rule 65

Int[((a_.) + (b_.)*(x_))^(m_)*((c_.) + (d_.)*(x_))^(n_), x_Symbol] :> With[{p = Denominator[m]}, Dist[p/b, Sub
st[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] &
& NeQ[b*c - a*d, 0] && LtQ[-1, m, 0] && LeQ[-1, n, 0] && LeQ[Denominator[n], Denominator[m]] && IntLinearQ[a,
b, c, d, m, n, x]

Rule 221

Int[1/Sqrt[(a_) + (b_.)*(x_)^2], x_Symbol] :> Simp[ArcSinh[Rt[b, 2]*(x/Sqrt[a])]/Rt[b, 2], x] /; FreeQ[{a, b},
x] && GtQ[a, 0] && PosQ[b]

Rubi steps

\begin {align*} \int \frac {1}{\sqrt {b x} \sqrt {4+b x}} \, dx &=\frac {2 \text {Subst}\left (\int \frac {1}{\sqrt {4+x^2}} \, dx,x,\sqrt {b x}\right )}{b}\\ &=\frac {2 \sinh ^{-1}\left (\frac {\sqrt {b x}}{2}\right )}{b}\\ \end {align*}

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Mathematica [B] Leaf count is larger than twice the leaf count of optimal. \(42\) vs. \(2(17)=34\).
time = 0.04, size = 42, normalized size = 2.47 \begin {gather*} -\frac {2 \sqrt {x} \log \left (-\sqrt {b} \sqrt {x}+\sqrt {4+b x}\right )}{\sqrt {b} \sqrt {b x}} \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[1/(Sqrt[b*x]*Sqrt[4 + b*x]),x]

[Out]

(-2*Sqrt[x]*Log[-(Sqrt[b]*Sqrt[x]) + Sqrt[4 + b*x]])/(Sqrt[b]*Sqrt[b*x])

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Maple [B] Leaf count of result is larger than twice the leaf count of optimal. \(59\) vs. \(2(13)=26\).
time = 0.14, size = 60, normalized size = 3.53

method	result	size
meijerg	\(\frac {2 \sqrt {x}\, \arcsinh \left (\frac {\sqrt {b}\, \sqrt {x}}{2}\right )}{\sqrt {b}\, \sqrt {b x}}\)	\(23\)
default	\(\frac {\sqrt {b x \left (b x +4\right )}\, \ln \left (\frac {b^{2} x +2 b}{\sqrt {b^{2}}}+\sqrt {x^{2} b^{2}+4 b x}\right )}{\sqrt {b x}\, \sqrt {b x +4}\, \sqrt {b^{2}}}\)	\(60\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(b*x)^(1/2)/(b*x+4)^(1/2),x,method=_RETURNVERBOSE)

[Out]

(b*x*(b*x+4))^(1/2)/(b*x)^(1/2)/(b*x+4)^(1/2)*ln((b^2*x+2*b)/(b^2)^(1/2)+(b^2*x^2+4*b*x)^(1/2))/(b^2)^(1/2)

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Maxima [B] Leaf count of result is larger than twice the leaf count of optimal. 32 vs. \(2 (13) = 26\).
time = 0.29, size = 32, normalized size = 1.88 \begin {gather*} \frac {\log \left (2 \, b^{2} x + 2 \, \sqrt {b^{2} x^{2} + 4 \, b x} b + 4 \, b\right )}{b} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(b*x)^(1/2)/(b*x+4)^(1/2),x, algorithm="maxima")

[Out]

log(2*b^2*x + 2*sqrt(b^2*x^2 + 4*b*x)*b + 4*b)/b

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Fricas [A]
time = 0.80, size = 25, normalized size = 1.47 \begin {gather*} -\frac {\log \left (-b x + \sqrt {b x + 4} \sqrt {b x} - 2\right )}{b} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(b*x)^(1/2)/(b*x+4)^(1/2),x, algorithm="fricas")

[Out]

-log(-b*x + sqrt(b*x + 4)*sqrt(b*x) - 2)/b

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Sympy [A]
time = 0.57, size = 15, normalized size = 0.88 \begin {gather*} \frac {2 \operatorname {asinh}{\left (\frac {\sqrt {b} \sqrt {x}}{2} \right )}}{b} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(b*x)**(1/2)/(b*x+4)**(1/2),x)

[Out]

2*asinh(sqrt(b)*sqrt(x)/2)/b

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Giac [A]
time = 2.60, size = 21, normalized size = 1.24 \begin {gather*} -\frac {2 \, \log \left (\sqrt {b x + 4} - \sqrt {b x}\right )}{b} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(b*x)^(1/2)/(b*x+4)^(1/2),x, algorithm="giac")

[Out]

-2*log(sqrt(b*x + 4) - sqrt(b*x))/b

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Mupad [B]
time = 0.31, size = 33, normalized size = 1.94 \begin {gather*} -\frac {4\,\mathrm {atan}\left (\frac {b\,\left (\sqrt {b\,x+4}-2\right )}{\sqrt {b\,x}\,\sqrt {-b^2}}\right )}{\sqrt {-b^2}} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/((b*x)^(1/2)*(b*x + 4)^(1/2)),x)

[Out]

-(4*atan((b*((b*x + 4)^(1/2) - 2))/((b*x)^(1/2)*(-b^2)^(1/2))))/(-b^2)^(1/2)

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