3.46 \(\int x^2 \tanh ^{-1}(\tanh (a+b x))^2 \, dx\)

Optimal. Leaf size=42 \[ -\frac{1}{6} b x^4 \tanh ^{-1}(\tanh (a+b x))+\frac{1}{3} x^3 \tanh ^{-1}(\tanh (a+b x))^2+\frac{b^2 x^5}{30} \]

[Out]

(b^2*x^5)/30 - (b*x^4*ArcTanh[Tanh[a + b*x]])/6 + (x^3*ArcTanh[Tanh[a + b*x]]^2)/3

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Rubi [A]  time = 0.0221278, antiderivative size = 42, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 2, integrand size = 13, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.154, Rules used = {2168, 30} \[ -\frac{1}{6} b x^4 \tanh ^{-1}(\tanh (a+b x))+\frac{1}{3} x^3 \tanh ^{-1}(\tanh (a+b x))^2+\frac{b^2 x^5}{30} \]

Antiderivative was successfully verified.

[In]

Int[x^2*ArcTanh[Tanh[a + b*x]]^2,x]

[Out]

(b^2*x^5)/30 - (b*x^4*ArcTanh[Tanh[a + b*x]])/6 + (x^3*ArcTanh[Tanh[a + b*x]]^2)/3

Rule 2168

Int[(u_)^(m_)*(v_)^(n_.), x_Symbol] :> With[{a = Simplify[D[u, x]], b = Simplify[D[v, x]]}, Simp[(u^(m + 1)*v^
n)/(a*(m + 1)), x] - Dist[(b*n)/(a*(m + 1)), Int[u^(m + 1)*v^(n - 1), x], x] /; NeQ[b*u - a*v, 0]] /; FreeQ[{m
, n}, x] && PiecewiseLinearQ[u, v, x] && NeQ[m, -1] && ((LtQ[m, -1] && GtQ[n, 0] &&  !(ILtQ[m + n, -2] && (Fra
ctionQ[m] || GeQ[2*n + m + 1, 0]))) || (IGtQ[n, 0] && IGtQ[m, 0] && LeQ[n, m]) || (IGtQ[n, 0] &&  !IntegerQ[m]
) || (ILtQ[m, 0] &&  !IntegerQ[n]))

Rule 30

Int[(x_)^(m_.), x_Symbol] :> Simp[x^(m + 1)/(m + 1), x] /; FreeQ[m, x] && NeQ[m, -1]

Rubi steps

\begin{align*} \int x^2 \tanh ^{-1}(\tanh (a+b x))^2 \, dx &=\frac{1}{3} x^3 \tanh ^{-1}(\tanh (a+b x))^2-\frac{1}{3} (2 b) \int x^3 \tanh ^{-1}(\tanh (a+b x)) \, dx\\ &=-\frac{1}{6} b x^4 \tanh ^{-1}(\tanh (a+b x))+\frac{1}{3} x^3 \tanh ^{-1}(\tanh (a+b x))^2+\frac{1}{6} b^2 \int x^4 \, dx\\ &=\frac{b^2 x^5}{30}-\frac{1}{6} b x^4 \tanh ^{-1}(\tanh (a+b x))+\frac{1}{3} x^3 \tanh ^{-1}(\tanh (a+b x))^2\\ \end{align*}

Mathematica [A]  time = 0.0478986, size = 37, normalized size = 0.88 \[ \frac{1}{30} x^3 \left (-5 b x \tanh ^{-1}(\tanh (a+b x))+10 \tanh ^{-1}(\tanh (a+b x))^2+b^2 x^2\right ) \]

Antiderivative was successfully verified.

[In]

Integrate[x^2*ArcTanh[Tanh[a + b*x]]^2,x]

[Out]

(x^3*(b^2*x^2 - 5*b*x*ArcTanh[Tanh[a + b*x]] + 10*ArcTanh[Tanh[a + b*x]]^2))/30

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Maple [A]  time = 0.035, size = 38, normalized size = 0.9 \begin{align*}{\frac{{x}^{3} \left ({\it Artanh} \left ( \tanh \left ( bx+a \right ) \right ) \right ) ^{2}}{3}}-{\frac{2\,b}{3} \left ({\frac{{x}^{4}{\it Artanh} \left ( \tanh \left ( bx+a \right ) \right ) }{4}}-{\frac{b{x}^{5}}{20}} \right ) } \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(x^2*arctanh(tanh(b*x+a))^2,x)

[Out]

1/3*x^3*arctanh(tanh(b*x+a))^2-2/3*b*(1/4*x^4*arctanh(tanh(b*x+a))-1/20*b*x^5)

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Maxima [A]  time = 1.34477, size = 49, normalized size = 1.17 \begin{align*} \frac{1}{30} \, b^{2} x^{5} - \frac{1}{6} \, b x^{4} \operatorname{artanh}\left (\tanh \left (b x + a\right )\right ) + \frac{1}{3} \, x^{3} \operatorname{artanh}\left (\tanh \left (b x + a\right )\right )^{2} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^2*arctanh(tanh(b*x+a))^2,x, algorithm="maxima")

[Out]

1/30*b^2*x^5 - 1/6*b*x^4*arctanh(tanh(b*x + a)) + 1/3*x^3*arctanh(tanh(b*x + a))^2

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Fricas [A]  time = 1.53462, size = 55, normalized size = 1.31 \begin{align*} \frac{1}{5} \, b^{2} x^{5} + \frac{1}{2} \, a b x^{4} + \frac{1}{3} \, a^{2} x^{3} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^2*arctanh(tanh(b*x+a))^2,x, algorithm="fricas")

[Out]

1/5*b^2*x^5 + 1/2*a*b*x^4 + 1/3*a^2*x^3

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Sympy [A]  time = 1.74069, size = 37, normalized size = 0.88 \begin{align*} \frac{b^{2} x^{5}}{30} - \frac{b x^{4} \operatorname{atanh}{\left (\tanh{\left (a + b x \right )} \right )}}{6} + \frac{x^{3} \operatorname{atanh}^{2}{\left (\tanh{\left (a + b x \right )} \right )}}{3} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x**2*atanh(tanh(b*x+a))**2,x)

[Out]

b**2*x**5/30 - b*x**4*atanh(tanh(a + b*x))/6 + x**3*atanh(tanh(a + b*x))**2/3

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Giac [A]  time = 1.14106, size = 32, normalized size = 0.76 \begin{align*} \frac{1}{5} \, b^{2} x^{5} + \frac{1}{2} \, a b x^{4} + \frac{1}{3} \, a^{2} x^{3} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(x^2*arctanh(tanh(b*x+a))^2,x, algorithm="giac")

[Out]

1/5*b^2*x^5 + 1/2*a*b*x^4 + 1/3*a^2*x^3