3.12 \(\int \frac {\tan ^2(x)}{a+b \cos (x)} \, dx\)

Optimal. Leaf size=61 \[ -\frac {2 \sqrt {a-b} \sqrt {a+b} \tan ^{-1}\left (\frac {\sqrt {a-b} \tan \left (\frac {x}{2}\right )}{\sqrt {a+b}}\right )}{a^2}-\frac {b \tanh ^{-1}(\sin (x))}{a^2}+\frac {\tan (x)}{a} \]

[Out]

-b*arctanh(sin(x))/a^2-2*arctan((a-b)^(1/2)*tan(1/2*x)/(a+b)^(1/2))*(a-b)^(1/2)*(a+b)^(1/2)/a^2+tan(x)/a

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Rubi [A]  time = 0.22, antiderivative size = 61, normalized size of antiderivative = 1.00, number of steps used = 6, number of rules used = 6, integrand size = 13, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.462, Rules used = {2723, 3056, 3001, 3770, 2659, 205} \[ -\frac {2 \sqrt {a-b} \sqrt {a+b} \tan ^{-1}\left (\frac {\sqrt {a-b} \tan \left (\frac {x}{2}\right )}{\sqrt {a+b}}\right )}{a^2}-\frac {b \tanh ^{-1}(\sin (x))}{a^2}+\frac {\tan (x)}{a} \]

Antiderivative was successfully verified.

[In]

Int[Tan[x]^2/(a + b*Cos[x]),x]

[Out]

(-2*Sqrt[a - b]*Sqrt[a + b]*ArcTan[(Sqrt[a - b]*Tan[x/2])/Sqrt[a + b]])/a^2 - (b*ArcTanh[Sin[x]])/a^2 + Tan[x]
/a

Rule 205

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

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 2723

Int[((a_) + (b_.)*sin[(e_.) + (f_.)*(x_)])^(m_)/tan[(e_.) + (f_.)*(x_)]^2, x_Symbol] :> Int[((a + b*Sin[e + f*
x])^m*(1 - Sin[e + f*x]^2))/Sin[e + f*x]^2, x] /; FreeQ[{a, b, e, f, m}, x] && NeQ[a^2 - b^2, 0]

Rule 3001

Int[((A_.) + (B_.)*sin[(e_.) + (f_.)*(x_)])/(((a_.) + (b_.)*sin[(e_.) + (f_.)*(x_)])*((c_.) + (d_.)*sin[(e_.)
+ (f_.)*(x_)])), x_Symbol] :> Dist[(A*b - a*B)/(b*c - a*d), Int[1/(a + b*Sin[e + f*x]), x], x] + Dist[(B*c - A
*d)/(b*c - a*d), Int[1/(c + d*Sin[e + f*x]), x], x] /; FreeQ[{a, b, c, d, e, f, A, B}, x] && NeQ[b*c - a*d, 0]
&& NeQ[a^2 - b^2, 0] && NeQ[c^2 - d^2, 0]

Rule 3056

Int[((a_.) + (b_.)*sin[(e_.) + (f_.)*(x_)])^(m_)*((c_.) + (d_.)*sin[(e_.) + (f_.)*(x_)])^(n_)*((A_.) + (C_.)*s
in[(e_.) + (f_.)*(x_)]^2), x_Symbol] :> -Simp[((A*b^2 + a^2*C)*Cos[e + f*x]*(a + b*Sin[e + f*x])^(m + 1)*(c +
d*Sin[e + f*x])^(n + 1))/(f*(m + 1)*(b*c - a*d)*(a^2 - b^2)), x] + Dist[1/((m + 1)*(b*c - a*d)*(a^2 - b^2)), I
nt[(a + b*Sin[e + f*x])^(m + 1)*(c + d*Sin[e + f*x])^n*Simp[a*(m + 1)*(b*c - a*d)*(A + C) + d*(A*b^2 + a^2*C)*
(m + n + 2) - (c*(A*b^2 + a^2*C) + b*(m + 1)*(b*c - a*d)*(A + C))*Sin[e + f*x] - d*(A*b^2 + a^2*C)*(m + n + 3)
*Sin[e + f*x]^2, x], x], x] /; FreeQ[{a, b, c, d, e, f, A, C, n}, x] && NeQ[b*c - a*d, 0] && NeQ[a^2 - b^2, 0]
&& NeQ[c^2 - d^2, 0] && LtQ[m, -1] && ((EqQ[a, 0] && IntegerQ[m] &&  !IntegerQ[n]) ||  !(IntegerQ[2*n] && LtQ
[n, -1] && ((IntegerQ[n] &&  !IntegerQ[m]) || EqQ[a, 0])))

Rule 3770

Int[csc[(c_.) + (d_.)*(x_)], x_Symbol] :> -Simp[ArcTanh[Cos[c + d*x]]/d, x] /; FreeQ[{c, d}, x]

Rubi steps

\begin {align*} \int \frac {\tan ^2(x)}{a+b \cos (x)} \, dx &=\int \frac {\left (1-\cos ^2(x)\right ) \sec ^2(x)}{a+b \cos (x)} \, dx\\ &=\frac {\tan (x)}{a}+\frac {\int \frac {(-b-a \cos (x)) \sec (x)}{a+b \cos (x)} \, dx}{a}\\ &=\frac {\tan (x)}{a}-\frac {b \int \sec (x) \, dx}{a^2}+\frac {\left (-a^2+b^2\right ) \int \frac {1}{a+b \cos (x)} \, dx}{a^2}\\ &=-\frac {b \tanh ^{-1}(\sin (x))}{a^2}+\frac {\tan (x)}{a}+\frac {\left (2 \left (-a^2+b^2\right )\right ) \operatorname {Subst}\left (\int \frac {1}{a+b+(a-b) x^2} \, dx,x,\tan \left (\frac {x}{2}\right )\right )}{a^2}\\ &=-\frac {2 \sqrt {a-b} \sqrt {a+b} \tan ^{-1}\left (\frac {\sqrt {a-b} \tan \left (\frac {x}{2}\right )}{\sqrt {a+b}}\right )}{a^2}-\frac {b \tanh ^{-1}(\sin (x))}{a^2}+\frac {\tan (x)}{a}\\ \end {align*}

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Mathematica [A]  time = 0.18, size = 85, normalized size = 1.39 \[ \frac {-2 \sqrt {b^2-a^2} \tanh ^{-1}\left (\frac {(a-b) \tan \left (\frac {x}{2}\right )}{\sqrt {b^2-a^2}}\right )+a \tan (x)+b \left (\log \left (\cos \left (\frac {x}{2}\right )-\sin \left (\frac {x}{2}\right )\right )-\log \left (\sin \left (\frac {x}{2}\right )+\cos \left (\frac {x}{2}\right )\right )\right )}{a^2} \]

Antiderivative was successfully verified.

[In]

Integrate[Tan[x]^2/(a + b*Cos[x]),x]

[Out]

(-2*Sqrt[-a^2 + b^2]*ArcTanh[((a - b)*Tan[x/2])/Sqrt[-a^2 + b^2]] + b*(Log[Cos[x/2] - Sin[x/2]] - Log[Cos[x/2]
+ Sin[x/2]]) + a*Tan[x])/a^2

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fricas [A]  time = 0.95, size = 203, normalized size = 3.33 \[ \left [-\frac {b \cos \relax (x) \log \left (\sin \relax (x) + 1\right ) - b \cos \relax (x) \log \left (-\sin \relax (x) + 1\right ) - \sqrt {-a^{2} + b^{2}} \cos \relax (x) \log \left (\frac {2 \, a b \cos \relax (x) + {\left (2 \, a^{2} - b^{2}\right )} \cos \relax (x)^{2} + 2 \, \sqrt {-a^{2} + b^{2}} {\left (a \cos \relax (x) + b\right )} \sin \relax (x) - a^{2} + 2 \, b^{2}}{b^{2} \cos \relax (x)^{2} + 2 \, a b \cos \relax (x) + a^{2}}\right ) - 2 \, a \sin \relax (x)}{2 \, a^{2} \cos \relax (x)}, -\frac {b \cos \relax (x) \log \left (\sin \relax (x) + 1\right ) - b \cos \relax (x) \log \left (-\sin \relax (x) + 1\right ) + 2 \, \sqrt {a^{2} - b^{2}} \arctan \left (-\frac {a \cos \relax (x) + b}{\sqrt {a^{2} - b^{2}} \sin \relax (x)}\right ) \cos \relax (x) - 2 \, a \sin \relax (x)}{2 \, a^{2} \cos \relax (x)}\right ] \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(tan(x)^2/(a+b*cos(x)),x, algorithm="fricas")

[Out]

[-1/2*(b*cos(x)*log(sin(x) + 1) - b*cos(x)*log(-sin(x) + 1) - sqrt(-a^2 + b^2)*cos(x)*log((2*a*b*cos(x) + (2*a
^2 - b^2)*cos(x)^2 + 2*sqrt(-a^2 + b^2)*(a*cos(x) + b)*sin(x) - a^2 + 2*b^2)/(b^2*cos(x)^2 + 2*a*b*cos(x) + a^
2)) - 2*a*sin(x))/(a^2*cos(x)), -1/2*(b*cos(x)*log(sin(x) + 1) - b*cos(x)*log(-sin(x) + 1) + 2*sqrt(a^2 - b^2)
*arctan(-(a*cos(x) + b)/(sqrt(a^2 - b^2)*sin(x)))*cos(x) - 2*a*sin(x))/(a^2*cos(x))]

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giac [B]  time = 0.48, size = 111, normalized size = 1.82 \[ -\frac {b \log \left ({\left | \tan \left (\frac {1}{2} \, x\right ) + 1 \right |}\right )}{a^{2}} + \frac {b \log \left ({\left | \tan \left (\frac {1}{2} \, x\right ) - 1 \right |}\right )}{a^{2}} + \frac {2 \, {\left (\pi \left \lfloor \frac {x}{2 \, \pi } + \frac {1}{2} \right \rfloor \mathrm {sgn}\left (-2 \, a + 2 \, b\right ) + \arctan \left (-\frac {a \tan \left (\frac {1}{2} \, x\right ) - b \tan \left (\frac {1}{2} \, x\right )}{\sqrt {a^{2} - b^{2}}}\right )\right )} \sqrt {a^{2} - b^{2}}}{a^{2}} - \frac {2 \, \tan \left (\frac {1}{2} \, x\right )}{{\left (\tan \left (\frac {1}{2} \, x\right )^{2} - 1\right )} a} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(tan(x)^2/(a+b*cos(x)),x, algorithm="giac")

[Out]

-b*log(abs(tan(1/2*x) + 1))/a^2 + b*log(abs(tan(1/2*x) - 1))/a^2 + 2*(pi*floor(1/2*x/pi + 1/2)*sgn(-2*a + 2*b)
+ arctan(-(a*tan(1/2*x) - b*tan(1/2*x))/sqrt(a^2 - b^2)))*sqrt(a^2 - b^2)/a^2 - 2*tan(1/2*x)/((tan(1/2*x)^2 -
1)*a)

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maple [B]  time = 0.05, size = 129, normalized size = 2.11 \[ -\frac {2 \arctan \left (\frac {\tan \left (\frac {x}{2}\right ) \left (a -b \right )}{\sqrt {\left (a -b \right ) \left (a +b \right )}}\right )}{\sqrt {\left (a -b \right ) \left (a +b \right )}}+\frac {2 \arctan \left (\frac {\tan \left (\frac {x}{2}\right ) \left (a -b \right )}{\sqrt {\left (a -b \right ) \left (a +b \right )}}\right ) b^{2}}{a^{2} \sqrt {\left (a -b \right ) \left (a +b \right )}}-\frac {1}{a \left (\tan \left (\frac {x}{2}\right )-1\right )}+\frac {b \ln \left (\tan \left (\frac {x}{2}\right )-1\right )}{a^{2}}-\frac {1}{a \left (\tan \left (\frac {x}{2}\right )+1\right )}-\frac {b \ln \left (\tan \left (\frac {x}{2}\right )+1\right )}{a^{2}} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(tan(x)^2/(a+b*cos(x)),x)

[Out]

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

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maxima [F(-2)]  time = 0.00, size = 0, normalized size = 0.00 \[ \text {Exception raised: ValueError} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(tan(x)^2/(a+b*cos(x)),x, algorithm="maxima")

[Out]

Exception raised: ValueError >> Computation failed since Maxima requested additional constraints; using the 'a
ssume' command before evaluation *may* help (example of legal syntax is 'assume(4*b^2-4*a^2>0)', see `assume?`
for more details)Is 4*b^2-4*a^2 positive or negative?

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mupad [B]  time = 0.55, size = 77, normalized size = 1.26 \[ \frac {2\,\mathrm {atanh}\left (\frac {\sin \left (\frac {x}{2}\right )\,\sqrt {b^2-a^2}}{a\,\cos \left (\frac {x}{2}\right )+b\,\cos \left (\frac {x}{2}\right )}\right )\,\sqrt {b^2-a^2}}{a^2}-\frac {2\,b\,\mathrm {atanh}\left (\frac {\sin \left (\frac {x}{2}\right )}{\cos \left (\frac {x}{2}\right )}\right )}{a^2}+\frac {\sin \relax (x)}{a\,\cos \relax (x)} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(tan(x)^2/(a + b*cos(x)),x)

[Out]

(2*atanh((sin(x/2)*(b^2 - a^2)^(1/2))/(a*cos(x/2) + b*cos(x/2)))*(b^2 - a^2)^(1/2))/a^2 - (2*b*atanh(sin(x/2)/
cos(x/2)))/a^2 + sin(x)/(a*cos(x))

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

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(tan(x)**2/(a+b*cos(x)),x)

[Out]

Integral(tan(x)**2/(a + b*cos(x)), x)

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