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

Optimal. Leaf size=27 \[ -2 i a \log (x)+2 i a \log (-a x+i)-\frac {1}{x} \]

[Out]

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

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Rubi [A]  time = 0.03, antiderivative size = 27, 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} \[ -2 i a \log (x)+2 i a \log (-a x+i)-\frac {1}{x} \]

Antiderivative was successfully verified.

[In]

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

[Out]

-x^(-1) - (2*I)*a*Log[x] + (2*I)*a*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^2} \, dx &=\int \frac {1-i a x}{x^2 (1+i a x)} \, dx\\ &=\int \left (\frac {1}{x^2}-\frac {2 i a}{x}+\frac {2 i a^2}{-i+a x}\right ) \, dx\\ &=-\frac {1}{x}-2 i a \log (x)+2 i a \log (i-a x)\\ \end {align*}

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Mathematica [A]  time = 0.01, size = 27, normalized size = 1.00 \[ -2 i a \log (x)+2 i a \log (-a x+i)-\frac {1}{x} \]

Antiderivative was successfully verified.

[In]

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

[Out]

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

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fricas [A]  time = 0.42, size = 26, normalized size = 0.96 \[ \frac {-2 i \, a x \log \relax (x) + 2 i \, a x \log \left (\frac {a x - i}{a}\right ) - 1}{x} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

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

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giac [A]  time = 0.13, size = 37, normalized size = 1.37 \[ -2 \, a i \log \left (-i + \frac {i}{a i x + 1}\right ) + \frac {a}{i - \frac {i}{a i x + 1}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-2*a*i*log(-i + i/(a*i*x + 1)) + a/(i - i/(a*i*x + 1))

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maple [A]  time = 0.07, size = 34, normalized size = 1.26 \[ -\frac {1}{x}-2 i a \ln \relax (x )-2 a \arctan \left (a x \right )+i a \ln \left (a^{2} x^{2}+1\right ) \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

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

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maxima [A]  time = 0.33, size = 34, normalized size = 1.26 \[ 2 i \, a \log \left (i \, a x + 1\right ) - 2 i \, a \log \relax (x) - \frac {a x - i}{a x^{2} - i \, x} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

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

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mupad [B]  time = 0.42, size = 17, normalized size = 0.63 \[ -4\,a\,\mathrm {atan}\left (2\,a\,x-\mathrm {i}\right )-\frac {1}{x} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

- 4*a*atan(2*a*x - 1i) - 1/x

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sympy [A]  time = 0.16, size = 32, normalized size = 1.19 \[ - 2 a \left (i \log {\left (4 a^{2} x \right )} - i \log {\left (4 a^{2} x - 4 i a \right )}\right ) - \frac {1}{x} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

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

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