3.61 \(\int \frac {1}{2+3 \cos ^2(x)} \, dx\)

Optimal. Leaf size=37 \[ \frac {x}{\sqrt {10}}-\frac {\tan ^{-1}\left (\frac {3 \sin (x) \cos (x)}{3 \cos ^2(x)+\sqrt {10}+2}\right )}{\sqrt {10}} \]

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Rubi [A]  time = 0.02, antiderivative size = 48, normalized size of antiderivative = 1.30, number of steps used = 2, number of rules used = 2, integrand size = 10, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.200, Rules used = {3181, 203} \[ \frac {x}{\sqrt {10}}-\frac {\tan ^{-1}\left (\frac {\left (\sqrt {\frac {5}{2}}-1\right ) \sin (x) \cos (x)}{\left (\sqrt {\frac {5}{2}}-1\right ) \cos ^2(x)+1}\right )}{\sqrt {10}} \]

Antiderivative was successfully verified.

[In]

Int[(2 + 3*Cos[x]^2)^(-1),x]

[Out]

x/Sqrt[10] - ArcTan[((-1 + Sqrt[5/2])*Cos[x]*Sin[x])/(1 + (-1 + Sqrt[5/2])*Cos[x]^2)]/Sqrt[10]

Rule 203

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

Rule 3181

Int[((a_) + (b_.)*sin[(e_.) + (f_.)*(x_)]^2)^(-1), x_Symbol] :> With[{ff = FreeFactors[Tan[e + f*x], x]}, Dist
[ff/f, Subst[Int[1/(a + (a + b)*ff^2*x^2), x], x, Tan[e + f*x]/ff], x]] /; FreeQ[{a, b, e, f}, x]

Rubi steps

\begin {align*} \int \frac {1}{2+3 \cos ^2(x)} \, dx &=-\operatorname {Subst}\left (\int \frac {1}{2+5 x^2} \, dx,x,\cot (x)\right )\\ &=\frac {x}{\sqrt {10}}-\frac {\tan ^{-1}\left (\frac {\left (-1+\sqrt {\frac {5}{2}}\right ) \cos (x) \sin (x)}{1+\left (-1+\sqrt {\frac {5}{2}}\right ) \cos ^2(x)}\right )}{\sqrt {10}}\\ \end {align*}

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Mathematica [A]  time = 0.05, size = 17, normalized size = 0.46 \[ \frac {\tan ^{-1}\left (\sqrt {\frac {2}{5}} \tan (x)\right )}{\sqrt {10}} \]

Antiderivative was successfully verified.

[In]

Integrate[(2 + 3*Cos[x]^2)^(-1),x]

[Out]

ArcTan[Sqrt[2/5]*Tan[x]]/Sqrt[10]

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IntegrateAlgebraic [F]  time = 0.00, size = 0, normalized size = 0.00 \[ \int \frac {1}{2+3 \cos ^2(x)} \, dx \]

Verification is Not applicable to the result.

[In]

IntegrateAlgebraic[(2 + 3*Cos[x]^2)^(-1),x]

[Out]

Could not integrate

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fricas [A]  time = 0.98, size = 31, normalized size = 0.84 \[ -\frac {1}{20} \, \sqrt {10} \arctan \left (\frac {7 \, \sqrt {10} \cos \relax (x)^{2} - 2 \, \sqrt {10}}{20 \, \cos \relax (x) \sin \relax (x)}\right ) \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-1/20*sqrt(10)*arctan(1/20*(7*sqrt(10)*cos(x)^2 - 2*sqrt(10))/(cos(x)*sin(x)))

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giac [A]  time = 0.82, size = 46, normalized size = 1.24 \[ \frac {1}{10} \, \sqrt {10} {\left (x + \arctan \left (-\frac {\sqrt {10} \sin \left (2 \, x\right ) - 2 \, \sin \left (2 \, x\right )}{\sqrt {10} \cos \left (2 \, x\right ) + \sqrt {10} - 2 \, \cos \left (2 \, x\right ) + 2}\right )\right )} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

1/10*sqrt(10)*(x + arctan(-(sqrt(10)*sin(2*x) - 2*sin(2*x))/(sqrt(10)*cos(2*x) + sqrt(10) - 2*cos(2*x) + 2)))

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maple [A]  time = 0.08, size = 14, normalized size = 0.38

method	result	size
default	\(\frac {\sqrt {10}\, \arctan \left (\frac {\tan \relax (x ) \sqrt {10}}{5}\right )}{10}\)	\(14\)
risch	\(\frac {i \sqrt {10}\, \ln \left ({\mathrm e}^{2 i x}+\frac {2 \sqrt {10}}{3}+\frac {7}{3}\right )}{20}-\frac {i \sqrt {10}\, \ln \left ({\mathrm e}^{2 i x}-\frac {2 \sqrt {10}}{3}+\frac {7}{3}\right )}{20}\)	\(40\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(2+3*cos(x)^2),x,method=_RETURNVERBOSE)

[Out]

1/10*10^(1/2)*arctan(1/5*tan(x)*10^(1/2))

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maxima [A]  time = 0.97, size = 13, normalized size = 0.35 \[ \frac {1}{10} \, \sqrt {10} \arctan \left (\frac {1}{5} \, \sqrt {10} \tan \relax (x)\right ) \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

1/10*sqrt(10)*arctan(1/5*sqrt(10)*tan(x))

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mupad [B]  time = 0.24, size = 26, normalized size = 0.70 \[ \frac {\sqrt {10}\,\left (x-\mathrm {atan}\left (\mathrm {tan}\relax (x)\right )\right )}{10}+\frac {\sqrt {10}\,\mathrm {atan}\left (\frac {\sqrt {10}\,\mathrm {tan}\relax (x)}{5}\right )}{10} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(1/(3*cos(x)^2 + 2),x)

[Out]

(10^(1/2)*(x - atan(tan(x))))/10 + (10^(1/2)*atan((10^(1/2)*tan(x))/5))/10

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sympy [F]  time = 0.00, size = 0, normalized size = 0.00 \[ \int \frac {1}{3 \cos ^{2}{\relax (x )} + 2}\, dx \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

Integral(1/(3*cos(x)**2 + 2), x)

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