\(\int x^2 \text {erfi}(d (a+b \log (c x^n))) \, dx\) [246]

Optimal result

Integrand size = 17, antiderivative size = 102 \[ \int x^2 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\frac {1}{3} x^3 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {1}{3} e^{-\frac {3 \left (3+4 a b d^2 n\right )}{4 b^2 d^2 n^2}} x^3 \left (c x^n\right )^{-3/n} \text {erfi}\left (\frac {2 a b d^2+\frac {3}{n}+2 b^2 d^2 \log \left (c x^n\right )}{2 b d}\right ) \]

[Out]

1/3*x^3*erfi(d*(a+b*ln(c*x^n)))-1/3*x^3*erfi(1/2*(2*a*b*d^2+3/n+2*b^2*d^2*ln(c*x^n))/b/d)/exp(3/4*(4*a*b*d^2*n
+3)/b^2/d^2/n^2)/((c*x^n)^(3/n))

Rubi [A] (verified)

Time = 0.13 (sec) , antiderivative size = 102, normalized size of antiderivative = 1.00, number of steps used = 5, number of rules used = 5, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.294, Rules used = {6538, 2314, 2308, 2266, 2235} \[ \int x^2 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\frac {1}{3} x^3 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {1}{3} x^3 \left (c x^n\right )^{-3/n} e^{-\frac {3 \left (4 a b d^2 n+3\right )}{4 b^2 d^2 n^2}} \text {erfi}\left (\frac {2 a b d^2+2 b^2 d^2 \log \left (c x^n\right )+\frac {3}{n}}{2 b d}\right ) \]

[In]

Int[x^2*Erfi[d*(a + b*Log[c*x^n])],x]

[Out]

(x^3*Erfi[d*(a + b*Log[c*x^n])])/3 - (x^3*Erfi[(2*a*b*d^2 + 3/n + 2*b^2*d^2*Log[c*x^n])/(2*b*d)])/(3*E^((3*(3
+ 4*a*b*d^2*n))/(4*b^2*d^2*n^2))*(c*x^n)^(3/n))

Rule 2235

Int[(F_)^((a_.) + (b_.)*((c_.) + (d_.)*(x_))^2), x_Symbol] :> Simp[F^a*Sqrt[Pi]*(Erfi[(c + d*x)*Rt[b*Log[F], 2
]]/(2*d*Rt[b*Log[F], 2])), x] /; FreeQ[{F, a, b, c, d}, x] && PosQ[b]

Rule 2266

Int[(F_)^((a_.) + (b_.)*(x_) + (c_.)*(x_)^2), x_Symbol] :> Dist[F^(a - b^2/(4*c)), Int[F^((b + 2*c*x)^2/(4*c))
, x], x] /; FreeQ[{F, a, b, c}, x]

Rule 2308

Int[(F_)^(((a_.) + Log[(c_.)*((d_.) + (e_.)*(x_))^(n_.)]^2*(b_.))*(f_.))*((g_.) + (h_.)*(x_))^(m_.), x_Symbol]
:> Dist[(g + h*x)^(m + 1)/(h*n*(c*(d + e*x)^n)^((m + 1)/n)), Subst[Int[E^(a*f*Log[F] + ((m + 1)*x)/n + b*f*Lo
g[F]*x^2), x], x, Log[c*(d + e*x)^n]], x] /; FreeQ[{F, a, b, c, d, e, f, g, h, m, n}, x] && EqQ[e*g - d*h, 0]

Rule 2314

Int[(F_)^(((a_.) + Log[(c_.)*((d_.) + (e_.)*(x_))^(n_.)]*(b_.))^2*(f_.))*((g_.) + (h_.)*(x_))^(m_.), x_Symbol]
:> Dist[(g + h*x)^m*((c*(d + e*x)^n)^(2*a*b*f*Log[F])/(d + e*x)^(m + 2*a*b*f*n*Log[F])), Int[(d + e*x)^(m + 2
*a*b*f*n*Log[F])*F^(a^2*f + b^2*f*Log[c*(d + e*x)^n]^2), x], x] /; FreeQ[{F, a, b, c, d, e, f, g, h, m, n}, x]
&& EqQ[e*g - d*h, 0]

Rule 6538

Int[Erfi[((a_.) + Log[(c_.)*(x_)^(n_.)]*(b_.))*(d_.)]*((e_.)*(x_))^(m_.), x_Symbol] :> Simp[(e*x)^(m + 1)*(Erf
i[d*(a + b*Log[c*x^n])]/(e*(m + 1))), x] - Dist[2*b*d*(n/(Sqrt[Pi]*(m + 1))), Int[(e*x)^m*E^(d*(a + b*Log[c*x^
n]))^2, x], x] /; FreeQ[{a, b, c, d, e, m, n}, x] && NeQ[m, -1]

Rubi steps \begin{align*} \text {integral}& = \frac {1}{3} x^3 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {(2 b d n) \int e^{d^2 \left (a+b \log \left (c x^n\right )\right )^2} x^2 \, dx}{3 \sqrt {\pi }} \\ & = \frac {1}{3} x^3 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {\left (2 b d n x^{-2 a b d^2 n} \left (c x^n\right )^{2 a b d^2}\right ) \int e^{a^2 d^2+b^2 d^2 \log ^2\left (c x^n\right )} x^{2+2 a b d^2 n} \, dx}{3 \sqrt {\pi }} \\ & = \frac {1}{3} x^3 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {\left (2 b d x^3 \left (c x^n\right )^{2 a b d^2-\frac {3+2 a b d^2 n}{n}}\right ) \text {Subst}\left (\int \exp \left (a^2 d^2+\frac {\left (3+2 a b d^2 n\right ) x}{n}+b^2 d^2 x^2\right ) \, dx,x,\log \left (c x^n\right )\right )}{3 \sqrt {\pi }} \\ & = \frac {1}{3} x^3 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {\left (2 b d e^{-\frac {3 \left (3+4 a b d^2 n\right )}{4 b^2 d^2 n^2}} x^3 \left (c x^n\right )^{2 a b d^2-\frac {3+2 a b d^2 n}{n}}\right ) \text {Subst}\left (\int \exp \left (\frac {\left (\frac {3+2 a b d^2 n}{n}+2 b^2 d^2 x\right )^2}{4 b^2 d^2}\right ) \, dx,x,\log \left (c x^n\right )\right )}{3 \sqrt {\pi }} \\ & = \frac {1}{3} x^3 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {1}{3} e^{-\frac {3 \left (3+4 a b d^2 n\right )}{4 b^2 d^2 n^2}} x^3 \left (c x^n\right )^{-3/n} \text {erfi}\left (\frac {2 a b d^2+\frac {3}{n}+2 b^2 d^2 \log \left (c x^n\right )}{2 b d}\right ) \\ \end{align*}

Mathematica [A] (verified)

Time = 0.21 (sec) , antiderivative size = 90, normalized size of antiderivative = 0.88 \[ \int x^2 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\frac {1}{3} \left (x^3 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-e^{-\frac {3 \left (3+4 a b d^2 n\right )}{4 b^2 d^2 n^2}} x^3 \left (c x^n\right )^{-3/n} \text {erfi}\left (a d+\frac {3}{2 b d n}+b d \log \left (c x^n\right )\right )\right ) \]

[In]

Integrate[x^2*Erfi[d*(a + b*Log[c*x^n])],x]

[Out]

(x^3*Erfi[d*(a + b*Log[c*x^n])] - (x^3*Erfi[a*d + 3/(2*b*d*n) + b*d*Log[c*x^n]])/(E^((3*(3 + 4*a*b*d^2*n))/(4*
b^2*d^2*n^2))*(c*x^n)^(3/n)))/3

Maple [F]

\[\int x^{2} \operatorname {erfi}\left (d \left (a +b \ln \left (c \,x^{n}\right )\right )\right )d x\]

[In]

int(x^2*erfi(d*(a+b*ln(c*x^n))),x)

[Out]

int(x^2*erfi(d*(a+b*ln(c*x^n))),x)

Fricas [A] (verification not implemented)

none

Time = 0.26 (sec) , antiderivative size = 127, normalized size of antiderivative = 1.25 \[ \int x^2 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\frac {1}{3} \, x^{3} \operatorname {erfi}\left (b d \log \left (c x^{n}\right ) + a d\right ) + \frac {1}{3} \, \sqrt {-b^{2} d^{2} n^{2}} \operatorname {erf}\left (\frac {{\left (2 \, b^{2} d^{2} n^{2} \log \left (x\right ) + 2 \, b^{2} d^{2} n \log \left (c\right ) + 2 \, a b d^{2} n + 3\right )} \sqrt {-b^{2} d^{2} n^{2}}}{2 \, b^{2} d^{2} n^{2}}\right ) e^{\left (-\frac {3 \, {\left (4 \, b^{2} d^{2} n \log \left (c\right ) + 4 \, a b d^{2} n + 3\right )}}{4 \, b^{2} d^{2} n^{2}}\right )} \]

[In]

integrate(x^2*erfi(d*(a+b*log(c*x^n))),x, algorithm="fricas")

[Out]

1/3*x^3*erfi(b*d*log(c*x^n) + a*d) + 1/3*sqrt(-b^2*d^2*n^2)*erf(1/2*(2*b^2*d^2*n^2*log(x) + 2*b^2*d^2*n*log(c)
+ 2*a*b*d^2*n + 3)*sqrt(-b^2*d^2*n^2)/(b^2*d^2*n^2))*e^(-3/4*(4*b^2*d^2*n*log(c) + 4*a*b*d^2*n + 3)/(b^2*d^2*
n^2))

Sympy [F]

\[ \int x^2 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\int x^{2} \operatorname {erfi}{\left (a d + b d \log {\left (c x^{n} \right )} \right )}\, dx \]

[In]

integrate(x**2*erfi(d*(a+b*ln(c*x**n))),x)

[Out]

Integral(x**2*erfi(a*d + b*d*log(c*x**n)), x)

Maxima [F]

\[ \int x^2 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\int { x^{2} \operatorname {erfi}\left ({\left (b \log \left (c x^{n}\right ) + a\right )} d\right ) \,d x } \]

[In]

integrate(x^2*erfi(d*(a+b*log(c*x^n))),x, algorithm="maxima")

[Out]

integrate(x^2*erfi((b*log(c*x^n) + a)*d), x)

Giac [F]

\[ \int x^2 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\int { x^{2} \operatorname {erfi}\left ({\left (b \log \left (c x^{n}\right ) + a\right )} d\right ) \,d x } \]

[In]

integrate(x^2*erfi(d*(a+b*log(c*x^n))),x, algorithm="giac")

[Out]

integrate(x^2*erfi((b*log(c*x^n) + a)*d), x)

Mupad [F(-1)]

Timed out. \[ \int x^2 \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\int x^2\,\mathrm {erfi}\left (d\,\left (a+b\,\ln \left (c\,x^n\right )\right )\right ) \,d x \]

[In]

int(x^2*erfi(d*(a + b*log(c*x^n))),x)

[Out]

int(x^2*erfi(d*(a + b*log(c*x^n))), x)