3.6.31 \(\int \frac {e^x}{\sqrt {-a^2+e^{2 x}}} \, dx\) [531]

Optimal. Leaf size=20 \[ \tanh ^{-1}\left (\frac {e^x}{\sqrt {-a^2+e^{2 x}}}\right ) \]

[Out]

arctanh(exp(x)/(-a^2+exp(2*x))^(1/2))

________________________________________________________________________________________

Rubi [A]
time = 0.02, antiderivative size = 20, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 3, integrand size = 19, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.158, Rules used = {2281, 223, 212} \begin {gather*} \tanh ^{-1}\left (\frac {e^x}{\sqrt {e^{2 x}-a^2}}\right ) \end {gather*}

Antiderivative was successfully verified.

[In]

Int[E^x/Sqrt[-a^2 + E^(2*x)],x]

[Out]

ArcTanh[E^x/Sqrt[-a^2 + E^(2*x)]]

Rule 212

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(1/(Rt[a, 2]*Rt[-b, 2]))*ArcTanh[Rt[-b, 2]*(x/Rt[a, 2])], x]
/; FreeQ[{a, b}, x] && NegQ[a/b] && (GtQ[a, 0] || LtQ[b, 0])

Rule 223

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

Rule 2281

Int[((a_) + (b_.)*(F_)^((e_.)*((c_.) + (d_.)*(x_))))^(p_.)*(G_)^((h_.)*((f_.) + (g_.)*(x_))), x_Symbol] :> Wit
h[{m = FullSimplify[d*e*(Log[F]/(g*h*Log[G]))]}, Dist[Denominator[m]/(g*h*Log[G]), Subst[Int[x^(Denominator[m]
- 1)*(a + b*F^(c*e - d*e*(f/g))*x^Numerator[m])^p, x], x, G^(h*((f + g*x)/Denominator[m]))], x] /; LtQ[m, -1]
|| GtQ[m, 1]] /; FreeQ[{F, G, a, b, c, d, e, f, g, h, p}, x]

Rubi steps

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

________________________________________________________________________________________

Mathematica [A]
time = 0.03, size = 20, normalized size = 1.00 \begin {gather*} \tanh ^{-1}\left (\frac {e^x}{\sqrt {-a^2+e^{2 x}}}\right ) \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[E^x/Sqrt[-a^2 + E^(2*x)],x]

[Out]

ArcTanh[E^x/Sqrt[-a^2 + E^(2*x)]]

________________________________________________________________________________________

Maple [A]
time = 0.02, size = 17, normalized size = 0.85

method	result	size
default	\(\ln \left ({\mathrm e}^{x}+\sqrt {-a^{2}+{\mathrm e}^{2 x}}\right )\)	\(17\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(exp(x)/(-a^2+exp(2*x))^(1/2),x,method=_RETURNVERBOSE)

[Out]

ln(exp(x)+(-a^2+exp(x)^2)^(1/2))

________________________________________________________________________________________

Maxima [A]
time = 2.11, size = 20, normalized size = 1.00 \begin {gather*} \log \left (2 \, \sqrt {-a^{2} + e^{\left (2 \, x\right )}} + 2 \, e^{x}\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(exp(x)/(-a^2+exp(2*x))^(1/2),x, algorithm="maxima")

[Out]

log(2*sqrt(-a^2 + e^(2*x)) + 2*e^x)

________________________________________________________________________________________

Fricas [A]
time = 0.51, size = 20, normalized size = 1.00 \begin {gather*} -\log \left (\sqrt {-a^{2} + e^{\left (2 \, x\right )}} - e^{x}\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(exp(x)/(-a^2+exp(2*x))^(1/2),x, algorithm="fricas")

[Out]

-log(sqrt(-a^2 + e^(2*x)) - e^x)

________________________________________________________________________________________

Sympy [B] Leaf count of result is larger than twice the leaf count of optimal. 31 vs. \(2 (15) = 30\).
time = 0.35, size = 31, normalized size = 1.55 \begin {gather*} \begin {cases} \operatorname {asinh}{\left (\sqrt {- \frac {1}{a^{2}}} e^{x} \right )} & \text {for}\: a^{2} < 0 \\\operatorname {acosh}{\left (\sqrt {\frac {1}{a^{2}}} e^{x} \right )} & \text {for}\: a^{2} > 0 \end {cases} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(exp(x)/(-a**2+exp(2*x))**(1/2),x)

[Out]

Piecewise((asinh(sqrt(-1/a**2)*exp(x)), a**2 < 0), (acosh(sqrt(a**(-2))*exp(x)), a**2 > 0))

________________________________________________________________________________________

Giac [A]
time = 1.85, size = 20, normalized size = 1.00 \begin {gather*} -\log \left (-\sqrt {-a^{2} + e^{\left (2 \, x\right )}} + e^{x}\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(exp(x)/(-a^2+exp(2*x))^(1/2),x, algorithm="giac")

[Out]

-log(-sqrt(-a^2 + e^(2*x)) + e^x)

________________________________________________________________________________________

Mupad [B]
time = 0.41, size = 16, normalized size = 0.80 \begin {gather*} \ln \left ({\mathrm {e}}^x+\sqrt {{\mathrm {e}}^{2\,x}-a^2}\right ) \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(exp(x)/(exp(2*x) - a^2)^(1/2),x)

[Out]

log(exp(x) + (exp(2*x) - a^2)^(1/2))

________________________________________________________________________________________