3.11 \(\int \frac{\sin (x)}{a-b \cos (x)} \, dx\)

Optimal. Leaf size=12 \[ \frac{\log (a-b \cos (x))}{b} \]

[Out]

Log[a - b*Cos[x]]/b

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Rubi [A]  time = 0.0226925, antiderivative size = 12, normalized size of antiderivative = 1., number of steps used = 2, number of rules used = 2, integrand size = 12, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.167, Rules used = {2668, 31} \[ \frac{\log (a-b \cos (x))}{b} \]

Antiderivative was successfully verified.

[In]

Int[Sin[x]/(a - b*Cos[x]),x]

[Out]

Log[a - b*Cos[x]]/b

Rule 2668

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

Rule 31

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

Rubi steps

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

Mathematica [A]  time = 0.0185615, size = 12, normalized size = 1. \[ \frac{\log (a-b \cos (x))}{b} \]

Antiderivative was successfully verified.

[In]

Integrate[Sin[x]/(a - b*Cos[x]),x]

[Out]

Log[a - b*Cos[x]]/b

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Maple [A]  time = 0.007, size = 13, normalized size = 1.1 \begin{align*}{\frac{\ln \left ( a-b\cos \left ( x \right ) \right ) }{b}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(sin(x)/(a-b*cos(x)),x)

[Out]

ln(a-b*cos(x))/b

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Maxima [A]  time = 0.931421, size = 18, normalized size = 1.5 \begin{align*} \frac{\log \left (b \cos \left (x\right ) - a\right )}{b} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(sin(x)/(a-b*cos(x)),x, algorithm="maxima")

[Out]

log(b*cos(x) - a)/b

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Fricas [A]  time = 2.16931, size = 30, normalized size = 2.5 \begin{align*} \frac{\log \left (-b \cos \left (x\right ) + a\right )}{b} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(sin(x)/(a-b*cos(x)),x, algorithm="fricas")

[Out]

log(-b*cos(x) + a)/b

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Sympy [A]  time = 0.366212, size = 15, normalized size = 1.25 \begin{align*} \begin{cases} \frac{\log{\left (- \frac{a}{b} + \cos{\left (x \right )} \right )}}{b} & \text{for}\: b \neq 0 \\- \frac{\cos{\left (x \right )}}{a} & \text{otherwise} \end{cases} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(sin(x)/(a-b*cos(x)),x)

[Out]

Piecewise((log(-a/b + cos(x))/b, Ne(b, 0)), (-cos(x)/a, True))

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Giac [A]  time = 1.04691, size = 19, normalized size = 1.58 \begin{align*} \frac{\log \left ({\left | b \cos \left (x\right ) - a \right |}\right )}{b} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(sin(x)/(a-b*cos(x)),x, algorithm="giac")

[Out]

log(abs(b*cos(x) - a))/b