3.51 \(\int \frac {e^{-2 i \tan ^{-1}(a x)}}{x^4} \, dx\)

Optimal. Leaf size=49 \[ 2 i a^3 \log (x)-2 i a^3 \log (-a x+i)+\frac {2 a^2}{x}+\frac {i a}{x^2}-\frac {1}{3 x^3} \]

[Out]

-1/3/x^3+I*a/x^2+2*a^2/x+2*I*a^3*ln(x)-2*I*a^3*ln(I-a*x)

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Rubi [A]  time = 0.03, antiderivative size = 49, normalized size of antiderivative = 1.00, number of steps used = 3, number of rules used = 2, integrand size = 14, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.143, Rules used = {5062, 77} \[ \frac {2 a^2}{x}+2 i a^3 \log (x)-2 i a^3 \log (-a x+i)+\frac {i a}{x^2}-\frac {1}{3 x^3} \]

Antiderivative was successfully verified.

[In]

Int[1/(E^((2*I)*ArcTan[a*x])*x^4),x]

[Out]

-1/(3*x^3) + (I*a)/x^2 + (2*a^2)/x + (2*I)*a^3*Log[x] - (2*I)*a^3*Log[I - a*x]

Rule 77

Int[((a_.) + (b_.)*(x_))*((c_) + (d_.)*(x_))^(n_.)*((e_.) + (f_.)*(x_))^(p_.), x_Symbol] :> Int[ExpandIntegran
d[(a + b*x)*(c + d*x)^n*(e + f*x)^p, x], x] /; FreeQ[{a, b, c, d, e, f, n}, x] && NeQ[b*c - a*d, 0] && ((ILtQ[
n, 0] && ILtQ[p, 0]) || EqQ[p, 1] || (IGtQ[p, 0] && ( !IntegerQ[n] || LeQ[9*p + 5*(n + 2), 0] || GeQ[n + p + 1
, 0] || (GeQ[n + p + 2, 0] && RationalQ[a, b, c, d, e, f]))))

Rule 5062

Int[E^(ArcTan[(a_.)*(x_)]*(n_.))*(x_)^(m_.), x_Symbol] :> Int[(x^m*(1 - I*a*x)^((I*n)/2))/(1 + I*a*x)^((I*n)/2
), x] /; FreeQ[{a, m, n}, x] &&  !IntegerQ[(I*n - 1)/2]

Rubi steps

\begin {align*} \int \frac {e^{-2 i \tan ^{-1}(a x)}}{x^4} \, dx &=\int \frac {1-i a x}{x^4 (1+i a x)} \, dx\\ &=\int \left (\frac {1}{x^4}-\frac {2 i a}{x^3}-\frac {2 a^2}{x^2}+\frac {2 i a^3}{x}-\frac {2 i a^4}{-i+a x}\right ) \, dx\\ &=-\frac {1}{3 x^3}+\frac {i a}{x^2}+\frac {2 a^2}{x}+2 i a^3 \log (x)-2 i a^3 \log (i-a x)\\ \end {align*}

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Mathematica [A]  time = 0.02, size = 49, normalized size = 1.00 \[ 2 i a^3 \log (x)-2 i a^3 \log (-a x+i)+\frac {2 a^2}{x}+\frac {i a}{x^2}-\frac {1}{3 x^3} \]

Antiderivative was successfully verified.

[In]

Integrate[1/(E^((2*I)*ArcTan[a*x])*x^4),x]

[Out]

-1/3*1/x^3 + (I*a)/x^2 + (2*a^2)/x + (2*I)*a^3*Log[x] - (2*I)*a^3*Log[I - a*x]

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fricas [A]  time = 0.42, size = 47, normalized size = 0.96 \[ \frac {6 i \, a^{3} x^{3} \log \relax (x) - 6 i \, a^{3} x^{3} \log \left (\frac {a x - i}{a}\right ) + 6 \, a^{2} x^{2} + 3 i \, a x - 1}{3 \, x^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

1/3*(6*I*a^3*x^3*log(x) - 6*I*a^3*x^3*log((a*x - I)/a) + 6*a^2*x^2 + 3*I*a*x - 1)/x^3

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giac [A]  time = 0.14, size = 77, normalized size = 1.57 \[ 2 \, a^{3} i \log \left (-i + \frac {i}{a i x + 1}\right ) + \frac {\frac {24 \, a^{3} i^{2}}{a i x + 1} + 10 \, a^{3} - \frac {15 \, a^{3} i^{2}}{{\left (a i x + 1\right )}^{2}}}{3 \, {\left (i - \frac {i}{a i x + 1}\right )}^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

2*a^3*i*log(-i + i/(a*i*x + 1)) + 1/3*(24*a^3*i^2/(a*i*x + 1) + 10*a^3 - 15*a^3*i^2/(a*i*x + 1)^2)/(i - i/(a*i
*x + 1))^3

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maple [A]  time = 0.06, size = 55, normalized size = 1.12 \[ -\frac {1}{3 x^{3}}+\frac {i a}{x^{2}}+2 i a^{3} \ln \relax (x )+\frac {2 a^{2}}{x}+2 a^{3} \arctan \left (a x \right )-i a^{3} \ln \left (a^{2} x^{2}+1\right ) \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-1/3/x^3+I*a/x^2+2*I*a^3*ln(x)+2*a^2/x+2*a^3*arctan(a*x)-I*a^3*ln(a^2*x^2+1)

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maxima [A]  time = 0.33, size = 57, normalized size = 1.16 \[ -2 i \, a^{3} \log \left (i \, a x + 1\right ) + 2 i \, a^{3} \log \relax (x) + \frac {6 i \, a^{3} x^{3} + 3 \, a^{2} x^{2} + 2 i \, a x - 1}{3 i \, a x^{4} + 3 \, x^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-2*I*a^3*log(I*a*x + 1) + 2*I*a^3*log(x) + (6*I*a^3*x^3 + 3*a^2*x^2 + 2*I*a*x - 1)/(3*I*a*x^4 + 3*x^3)

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mupad [B]  time = 0.43, size = 33, normalized size = 0.67 \[ 4\,a^3\,\mathrm {atan}\left (2\,a\,x-\mathrm {i}\right )+\frac {2\,a^2\,x^2+a\,x\,1{}\mathrm {i}-\frac {1}{3}}{x^3} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

4*a^3*atan(2*a*x - 1i) + (a*x*1i + 2*a^2*x^2 - 1/3)/x^3

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sympy [A]  time = 0.21, size = 54, normalized size = 1.10 \[ - 2 a^{3} \left (- i \log {\left (4 a^{4} x \right )} + i \log {\left (4 a^{4} x - 4 i a^{3} \right )}\right ) - \frac {- 6 a^{2} x^{2} - 3 i a x + 1}{3 x^{3}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(1/(1+I*a*x)**2*(a**2*x**2+1)/x**4,x)

[Out]

-2*a**3*(-I*log(4*a**4*x) + I*log(4*a**4*x - 4*I*a**3)) - (-6*a**2*x**2 - 3*I*a*x + 1)/(3*x**3)

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