Integrand size = 13, antiderivative size = 91 \[ \int \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=x \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-e^{-\frac {1+4 a b d^2 n}{4 b^2 d^2 n^2}} x \left (c x^n\right )^{-1/n} \text {erfi}\left (\frac {2 a b d^2+\frac {1}{n}+2 b^2 d^2 \log \left (c x^n\right )}{2 b d}\right ) \]
x*erfi(d*(a+b*ln(c*x^n)))-x*erfi(1/2*(2*a*b*d^2+1/n+2*b^2*d^2*ln(c*x^n))/b /d)/exp(1/4*(4*a*b*d^2*n+1)/b^2/d^2/n^2)/((c*x^n)^(1/n))
Time = 0.17 (sec) , antiderivative size = 78, normalized size of antiderivative = 0.86 \[ \int \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=x \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-e^{-\frac {\frac {\frac {1}{d^2}+4 a b n}{b^2}+4 n \log \left (c x^n\right )}{4 n^2}} x \text {erfi}\left (a d+\frac {1}{2 b d n}+b d \log \left (c x^n\right )\right ) \]
x*Erfi[d*(a + b*Log[c*x^n])] - (x*Erfi[a*d + 1/(2*b*d*n) + b*d*Log[c*x^n]] )/E^(((d^(-2) + 4*a*b*n)/b^2 + 4*n*Log[c*x^n])/(4*n^2))
Time = 0.42 (sec) , antiderivative size = 91, normalized size of antiderivative = 1.00, number of steps used = 6, number of rules used = 5, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.385, Rules used = {6953, 2710, 2706, 2664, 2633}
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.
\(\displaystyle \int \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx\) |
\(\Big \downarrow \) 6953 |
\(\displaystyle x \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {2 b d n \int e^{d^2 \left (a+b \log \left (c x^n\right )\right )^2}dx}{\sqrt {\pi }}\) |
\(\Big \downarrow \) 2710 |
\(\displaystyle x \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {2 b d n x^{-2 a b d^2 n} \left (c x^n\right )^{2 a b d^2} \int e^{a^2 d^2+b^2 \log ^2\left (c x^n\right ) d^2} x^{2 a b d^2 n}dx}{\sqrt {\pi }}\) |
\(\Big \downarrow \) 2706 |
\(\displaystyle x \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {2 b d x \left (c x^n\right )^{-1/n} \int \exp \left (a^2 d^2+b^2 \log ^2\left (c x^n\right ) d^2+\frac {\left (2 a b n d^2+1\right ) \log \left (c x^n\right )}{n}\right )d\log \left (c x^n\right )}{\sqrt {\pi }}\) |
\(\Big \downarrow \) 2664 |
\(\displaystyle x \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-\frac {2 b d x \left (c x^n\right )^{-1/n} e^{-\frac {4 a b d^2 n+1}{4 b^2 d^2 n^2}} \int \exp \left (\frac {\left (2 a b d^2+2 b^2 \log \left (c x^n\right ) d^2+\frac {1}{n}\right )^2}{4 b^2 d^2}\right )d\log \left (c x^n\right )}{\sqrt {\pi }}\) |
\(\Big \downarrow \) 2633 |
\(\displaystyle x \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right )-x \left (c x^n\right )^{-1/n} e^{-\frac {4 a b d^2 n+1}{4 b^2 d^2 n^2}} \text {erfi}\left (\frac {2 a b d^2+2 b^2 d^2 \log \left (c x^n\right )+\frac {1}{n}}{2 b d}\right )\) |
x*Erfi[d*(a + b*Log[c*x^n])] - (x*Erfi[(2*a*b*d^2 + n^(-1) + 2*b^2*d^2*Log [c*x^n])/(2*b*d)])/(E^((1 + 4*a*b*d^2*n)/(4*b^2*d^2*n^2))*(c*x^n)^n^(-1))
3.3.48.3.1 Defintions of rubi rules used
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]
Int[(F_)^((a_.) + (b_.)*(x_) + (c_.)*(x_)^2), x_Symbol] :> Simp[F^(a - b^2/ (4*c)) Int[F^((b + 2*c*x)^2/(4*c)), x], x] /; FreeQ[{F, a, b, c}, x]
Int[(F_)^(((a_.) + Log[(c_.)*((d_.) + (e_.)*(x_))^(n_.)]^2*(b_.))*(f_.))*(( g_.) + (h_.)*(x_))^(m_.), x_Symbol] :> Simp[(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*Log[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]
Int[(F_)^(((a_.) + Log[(c_.)*((d_.) + (e_.)*(x_))^(n_.)]*(b_.))^2*(f_.)), x _Symbol] :> Simp[((c*(d + e*x)^n)^(2*a*b*f*Log[F])/(d + e*x)^(2*a*b*f*n*Log [F]))*Int[(d + e*x)^(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, n}, x] && !IntegerQ[2*a*b*f*Log[ F]]
Int[Erfi[((a_.) + Log[(c_.)*(x_)^(n_.)]*(b_.))*(d_.)], x_Symbol] :> Simp[x* Erfi[d*(a + b*Log[c*x^n])], x] - Simp[2*b*d*(n/Sqrt[Pi]) Int[E^(d*(a + b* Log[c*x^n]))^2, x], x] /; FreeQ[{a, b, c, d, n}, x]
\[\int \operatorname {erfi}\left (d \left (a +b \ln \left (c \,x^{n}\right )\right )\right )d x\]
Time = 0.27 (sec) , antiderivative size = 123, normalized size of antiderivative = 1.35 \[ \int \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\sqrt {-b^{2} d^{2} n^{2}} \operatorname {erf}\left (\frac {{\left (2 \, b^{2} d^{2} n^{2} \log \left (x\right ) + 2 \, b^{2} d^{2} n \log \left (c\right ) + 2 \, a b d^{2} n + 1\right )} \sqrt {-b^{2} d^{2} n^{2}}}{2 \, b^{2} d^{2} n^{2}}\right ) e^{\left (-\frac {4 \, b^{2} d^{2} n \log \left (c\right ) + 4 \, a b d^{2} n + 1}{4 \, b^{2} d^{2} n^{2}}\right )} + x \operatorname {erfi}\left (b d \log \left (c x^{n}\right ) + a d\right ) \]
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 + 1)*sqrt(-b^2*d^2*n^2)/(b^2*d^2*n^2))*e^(-1/4*(4*b^2*d^2*n*log( c) + 4*a*b*d^2*n + 1)/(b^2*d^2*n^2)) + x*erfi(b*d*log(c*x^n) + a*d)
\[ \int \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\int \operatorname {erfi}{\left (d \left (a + b \log {\left (c x^{n} \right )}\right ) \right )}\, dx \]
\[ \int \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\int { \operatorname {erfi}\left ({\left (b \log \left (c x^{n}\right ) + a\right )} d\right ) \,d x } \]
\[ \int \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\int { \operatorname {erfi}\left ({\left (b \log \left (c x^{n}\right ) + a\right )} d\right ) \,d x } \]
Timed out. \[ \int \text {erfi}\left (d \left (a+b \log \left (c x^n\right )\right )\right ) \, dx=\int \mathrm {erfi}\left (d\,\left (a+b\,\ln \left (c\,x^n\right )\right )\right ) \,d x \]