3.1.4 \(\int \frac {\tan (x)}{a+a \cos (x)} \, dx\) [4]

Optimal. Leaf size=18 \[ -\frac {\log (\cos (x))}{a}+\frac {\log (1+\cos (x))}{a} \]

[Out]

-ln(cos(x))/a+ln(cos(x)+1)/a

________________________________________________________________________________________

Rubi [A]
time = 0.02, antiderivative size = 18, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 4, integrand size = 11, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.364, Rules used = {2786, 36, 29, 31} \begin {gather*} \frac {\log (\cos (x)+1)}{a}-\frac {\log (\cos (x))}{a} \end {gather*}

Antiderivative was successfully verified.

[In]

Int[Tan[x]/(a + a*Cos[x]),x]

[Out]

-(Log[Cos[x]]/a) + Log[1 + Cos[x]]/a

Rule 29

Int[(x_)^(-1), x_Symbol] :> Simp[Log[x], x]

Rule 31

Int[((a_) + (b_.)*(x_))^(-1), x_Symbol] :> Simp[Log[RemoveContent[a + b*x, x]]/b, x] /; FreeQ[{a, b}, x]

Rule 36

Int[1/(((a_.) + (b_.)*(x_))*((c_.) + (d_.)*(x_))), x_Symbol] :> Dist[b/(b*c - a*d), Int[1/(a + b*x), x], x] -
Dist[d/(b*c - a*d), Int[1/(c + d*x), x], x] /; FreeQ[{a, b, c, d}, x] && NeQ[b*c - a*d, 0]

Rule 2786

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

Rubi steps

\begin {align*} \int \frac {\tan (x)}{a+a \cos (x)} \, dx &=-\text {Subst}\left (\int \frac {1}{x (a+x)} \, dx,x,a \cos (x)\right )\\ &=-\frac {\text {Subst}\left (\int \frac {1}{x} \, dx,x,a \cos (x)\right )}{a}+\frac {\text {Subst}\left (\int \frac {1}{a+x} \, dx,x,a \cos (x)\right )}{a}\\ &=-\frac {\log (\cos (x))}{a}+\frac {\log (1+\cos (x))}{a}\\ \end {align*}

________________________________________________________________________________________

Mathematica [A]
time = 0.02, size = 12, normalized size = 0.67 \begin {gather*} \frac {2 \tanh ^{-1}(1+2 \cos (x))}{a} \end {gather*}

Antiderivative was successfully verified.

[In]

Integrate[Tan[x]/(a + a*Cos[x]),x]

[Out]

(2*ArcTanh[1 + 2*Cos[x]])/a

________________________________________________________________________________________

Maple [A]
time = 0.07, size = 17, normalized size = 0.94

method	result	size
derivativedivides	\(-\frac {\ln \left (\cos \left (x \right )\right )-\ln \left (\cos \left (x \right )+1\right )}{a}\)	\(17\)
default	\(-\frac {\ln \left (\cos \left (x \right )\right )-\ln \left (\cos \left (x \right )+1\right )}{a}\)	\(17\)
risch	\(\frac {2 \ln \left ({\mathrm e}^{i x}+1\right )}{a}-\frac {\ln \left ({\mathrm e}^{2 i x}+1\right )}{a}\)	\(28\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(tan(x)/(a+a*cos(x)),x,method=_RETURNVERBOSE)

[Out]

-1/a*(ln(cos(x))-ln(cos(x)+1))

________________________________________________________________________________________

Maxima [A]
time = 0.27, size = 18, normalized size = 1.00 \begin {gather*} \frac {\log \left (\cos \left (x\right ) + 1\right )}{a} - \frac {\log \left (\cos \left (x\right )\right )}{a} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

log(cos(x) + 1)/a - log(cos(x))/a

________________________________________________________________________________________

Fricas [A]
time = 0.39, size = 20, normalized size = 1.11 \begin {gather*} -\frac {\log \left (-\cos \left (x\right )\right ) - \log \left (\frac {1}{2} \, \cos \left (x\right ) + \frac {1}{2}\right )}{a} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

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

________________________________________________________________________________________

Sympy [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \frac {\int \frac {\tan {\left (x \right )}}{\cos {\left (x \right )} + 1}\, dx}{a} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

Integral(tan(x)/(cos(x) + 1), x)/a

________________________________________________________________________________________

Giac [A]
time = 0.47, size = 19, normalized size = 1.06 \begin {gather*} \frac {\log \left (\cos \left (x\right ) + 1\right )}{a} - \frac {\log \left ({\left | \cos \left (x\right ) \right |}\right )}{a} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

log(cos(x) + 1)/a - log(abs(cos(x)))/a

________________________________________________________________________________________

Mupad [B]
time = 0.40, size = 14, normalized size = 0.78 \begin {gather*} -\frac {\ln \left ({\mathrm {tan}\left (\frac {x}{2}\right )}^2-1\right )}{a} \end {gather*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(tan(x)/(a + a*cos(x)),x)

[Out]

-log(tan(x/2)^2 - 1)/a

________________________________________________________________________________________