3.22 \(\int -\frac{2}{1+3 \cos (4+6 x)} \, dx\)

Optimal. Leaf size=61 \[ \frac{\log \left (\sqrt{2} \cos (3 x+2)-\sin (3 x+2)\right )}{6 \sqrt{2}}-\frac{\log \left (\sin (3 x+2)+\sqrt{2} \cos (3 x+2)\right )}{6 \sqrt{2}} \]

[Out]

Log[Sqrt[2]*Cos[2 + 3*x] - Sin[2 + 3*x]]/(6*Sqrt[2]) - Log[Sqrt[2]*Cos[2 + 3*x] + Sin[2 + 3*x]]/(6*Sqrt[2])

________________________________________________________________________________________

Rubi [A]  time = 0.0303837, antiderivative size = 61, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 3, integrand size = 14, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.214, Rules used = {12, 2659, 206} \[ \frac{\log \left (\sqrt{2} \cos (3 x+2)-\sin (3 x+2)\right )}{6 \sqrt{2}}-\frac{\log \left (\sin (3 x+2)+\sqrt{2} \cos (3 x+2)\right )}{6 \sqrt{2}} \]

Antiderivative was successfully verified.

[In]

Int[-2/(1 + 3*Cos[4 + 6*x]),x]

[Out]

Log[Sqrt[2]*Cos[2 + 3*x] - Sin[2 + 3*x]]/(6*Sqrt[2]) - Log[Sqrt[2]*Cos[2 + 3*x] + Sin[2 + 3*x]]/(6*Sqrt[2])

Rule 12

Int[(a_)*(u_), x_Symbol] :> Dist[a, Int[u, x], x] /; FreeQ[a, x] &&  !MatchQ[u, (b_)*(v_) /; FreeQ[b, x]]

Rule 2659

Int[((a_) + (b_.)*sin[Pi/2 + (c_.) + (d_.)*(x_)])^(-1), x_Symbol] :> With[{e = FreeFactors[Tan[(c + d*x)/2], x
]}, Dist[(2*e)/d, Subst[Int[1/(a + b + (a - b)*e^2*x^2), x], x, Tan[(c + d*x)/2]/e], x]] /; FreeQ[{a, b, c, d}
, x] && NeQ[a^2 - b^2, 0]

Rule 206

Int[((a_) + (b_.)*(x_)^2)^(-1), x_Symbol] :> Simp[(1*ArcTanh[(Rt[-b, 2]*x)/Rt[a, 2]])/(Rt[a, 2]*Rt[-b, 2]), x]
/; FreeQ[{a, b}, x] && NegQ[a/b] && (GtQ[a, 0] || LtQ[b, 0])

Rubi steps

\begin{align*} \int -\frac{2}{1+3 \cos (4+6 x)} \, dx &=-\left (2 \int \frac{1}{1+3 \cos (4+6 x)} \, dx\right )\\ &=-\left (\frac{2}{3} \operatorname{Subst}\left (\int \frac{1}{4-2 x^2} \, dx,x,\tan \left (\frac{1}{2} (4+6 x)\right )\right )\right )\\ &=\frac{\log \left (\sqrt{2} \cos (2+3 x)-\sin (2+3 x)\right )}{6 \sqrt{2}}-\frac{\log \left (\sqrt{2} \cos (2+3 x)+\sin (2+3 x)\right )}{6 \sqrt{2}}\\ \end{align*}

Mathematica [A]  time = 0.0266506, size = 22, normalized size = 0.36 \[ -\frac{\tanh ^{-1}\left (\frac{\tan (3 x+2)}{\sqrt{2}}\right )}{3 \sqrt{2}} \]

Antiderivative was successfully verified.

[In]

Integrate[-2/(1 + 3*Cos[4 + 6*x]),x]

[Out]

-ArcTanh[Tan[2 + 3*x]/Sqrt[2]]/(3*Sqrt[2])

________________________________________________________________________________________

Maple [A]  time = 0.01, size = 18, normalized size = 0.3 \begin{align*} -{\frac{\sqrt{2}}{6}{\it Artanh} \left ({\frac{\tan \left ( 2+3\,x \right ) \sqrt{2}}{2}} \right ) } \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(-2/(1+3*cos(4+6*x)),x)

[Out]

-1/6*2^(1/2)*arctanh(1/2*tan(2+3*x)*2^(1/2))

________________________________________________________________________________________

Maxima [A]  time = 1.55537, size = 72, normalized size = 1.18 \begin{align*} \frac{1}{12} \, \sqrt{2} \log \left (-\frac{\sqrt{2} - \frac{\sin \left (6 \, x + 4\right )}{\cos \left (6 \, x + 4\right ) + 1}}{\sqrt{2} + \frac{\sin \left (6 \, x + 4\right )}{\cos \left (6 \, x + 4\right ) + 1}}\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(-2/(1+3*cos(4+6*x)),x, algorithm="maxima")

[Out]

1/12*sqrt(2)*log(-(sqrt(2) - sin(6*x + 4)/(cos(6*x + 4) + 1))/(sqrt(2) + sin(6*x + 4)/(cos(6*x + 4) + 1)))

________________________________________________________________________________________

Fricas [A]  time = 1.82479, size = 207, normalized size = 3.39 \begin{align*} \frac{1}{24} \, \sqrt{2} \log \left (-\frac{7 \, \cos \left (6 \, x + 4\right )^{2} + 4 \,{\left (\sqrt{2} \cos \left (6 \, x + 4\right ) + 3 \, \sqrt{2}\right )} \sin \left (6 \, x + 4\right ) - 6 \, \cos \left (6 \, x + 4\right ) - 17}{9 \, \cos \left (6 \, x + 4\right )^{2} + 6 \, \cos \left (6 \, x + 4\right ) + 1}\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(-2/(1+3*cos(4+6*x)),x, algorithm="fricas")

[Out]

1/24*sqrt(2)*log(-(7*cos(6*x + 4)^2 + 4*(sqrt(2)*cos(6*x + 4) + 3*sqrt(2))*sin(6*x + 4) - 6*cos(6*x + 4) - 17)
/(9*cos(6*x + 4)^2 + 6*cos(6*x + 4) + 1))

________________________________________________________________________________________

Sympy [A]  time = 0.398481, size = 39, normalized size = 0.64 \begin{align*} \frac{\sqrt{2} \log{\left (\tan{\left (3 x + 2 \right )} - \sqrt{2} \right )}}{12} - \frac{\sqrt{2} \log{\left (\tan{\left (3 x + 2 \right )} + \sqrt{2} \right )}}{12} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(-2/(1+3*cos(4+6*x)),x)

[Out]

sqrt(2)*log(tan(3*x + 2) - sqrt(2))/12 - sqrt(2)*log(tan(3*x + 2) + sqrt(2))/12

________________________________________________________________________________________

Giac [A]  time = 1.21, size = 53, normalized size = 0.87 \begin{align*} \frac{1}{12} \, \sqrt{2} \log \left (\frac{{\left | -2 \, \sqrt{2} + 2 \, \tan \left (3 \, x + 2\right ) \right |}}{{\left | 2 \, \sqrt{2} + 2 \, \tan \left (3 \, x + 2\right ) \right |}}\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(-2/(1+3*cos(4+6*x)),x, algorithm="giac")

[Out]

1/12*sqrt(2)*log(abs(-2*sqrt(2) + 2*tan(3*x + 2))/abs(2*sqrt(2) + 2*tan(3*x + 2)))