3.147 \(\int \frac{\sqrt{a+a \cos (c+d x)}}{x} \, dx\)

Optimal. Leaf size=84 \[ \cos \left (\frac{c}{2}\right ) \text{CosIntegral}\left (\frac{d x}{2}\right ) \sec \left (\frac{c}{2}+\frac{d x}{2}\right ) \sqrt{a \cos (c+d x)+a}-\sin \left (\frac{c}{2}\right ) \text{Si}\left (\frac{d x}{2}\right ) \sec \left (\frac{c}{2}+\frac{d x}{2}\right ) \sqrt{a \cos (c+d x)+a} \]

[Out]

Cos[c/2]*Sqrt[a + a*Cos[c + d*x]]*CosIntegral[(d*x)/2]*Sec[c/2 + (d*x)/2] - Sqrt[a + a*Cos[c + d*x]]*Sec[c/2 +
(d*x)/2]*Sin[c/2]*SinIntegral[(d*x)/2]

________________________________________________________________________________________

Rubi [A]  time = 0.121311, antiderivative size = 84, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 4, integrand size = 18, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.222, Rules used = {3319, 3303, 3299, 3302} \[ \cos \left (\frac{c}{2}\right ) \text{CosIntegral}\left (\frac{d x}{2}\right ) \sec \left (\frac{c}{2}+\frac{d x}{2}\right ) \sqrt{a \cos (c+d x)+a}-\sin \left (\frac{c}{2}\right ) \text{Si}\left (\frac{d x}{2}\right ) \sec \left (\frac{c}{2}+\frac{d x}{2}\right ) \sqrt{a \cos (c+d x)+a} \]

Antiderivative was successfully verified.

[In]

Int[Sqrt[a + a*Cos[c + d*x]]/x,x]

[Out]

Cos[c/2]*Sqrt[a + a*Cos[c + d*x]]*CosIntegral[(d*x)/2]*Sec[c/2 + (d*x)/2] - Sqrt[a + a*Cos[c + d*x]]*Sec[c/2 +
(d*x)/2]*Sin[c/2]*SinIntegral[(d*x)/2]

Rule 3319

Int[((c_.) + (d_.)*(x_))^(m_.)*((a_) + (b_.)*sin[(e_.) + (f_.)*(x_)])^(n_), x_Symbol] :> Dist[((2*a)^IntPart[n
]*(a + b*Sin[e + f*x])^FracPart[n])/Sin[e/2 + (a*Pi)/(4*b) + (f*x)/2]^(2*FracPart[n]), Int[(c + d*x)^m*Sin[e/2
+ (a*Pi)/(4*b) + (f*x)/2]^(2*n), x], x] /; FreeQ[{a, b, c, d, e, f, m}, x] && EqQ[a^2 - b^2, 0] && IntegerQ[n
+ 1/2] && (GtQ[n, 0] || IGtQ[m, 0])

Rule 3303

Int[sin[(e_.) + (f_.)*(x_)]/((c_.) + (d_.)*(x_)), x_Symbol] :> Dist[Cos[(d*e - c*f)/d], Int[Sin[(c*f)/d + f*x]
/(c + d*x), x], x] + Dist[Sin[(d*e - c*f)/d], Int[Cos[(c*f)/d + f*x]/(c + d*x), x], x] /; FreeQ[{c, d, e, f},
x] && NeQ[d*e - c*f, 0]

Rule 3299

Int[sin[(e_.) + (f_.)*(x_)]/((c_.) + (d_.)*(x_)), x_Symbol] :> Simp[SinIntegral[e + f*x]/d, x] /; FreeQ[{c, d,
e, f}, x] && EqQ[d*e - c*f, 0]

Rule 3302

Int[sin[(e_.) + (f_.)*(x_)]/((c_.) + (d_.)*(x_)), x_Symbol] :> Simp[CosIntegral[e - Pi/2 + f*x]/d, x] /; FreeQ
[{c, d, e, f}, x] && EqQ[d*(e - Pi/2) - c*f, 0]

Rubi steps

\begin{align*} \int \frac{\sqrt{a+a \cos (c+d x)}}{x} \, dx &=\left (\sqrt{a+a \cos (c+d x)} \csc \left (\frac{1}{2} \left (c+\frac{\pi }{2}\right )+\frac{\pi }{4}+\frac{d x}{2}\right )\right ) \int \frac{\sin \left (\frac{1}{2} \left (c+\frac{\pi }{2}\right )+\frac{\pi }{4}+\frac{d x}{2}\right )}{x} \, dx\\ &=\left (\cos \left (\frac{c}{2}\right ) \sqrt{a+a \cos (c+d x)} \csc \left (\frac{1}{2} \left (c+\frac{\pi }{2}\right )+\frac{\pi }{4}+\frac{d x}{2}\right )\right ) \int \frac{\cos \left (\frac{d x}{2}\right )}{x} \, dx-\left (\sqrt{a+a \cos (c+d x)} \csc \left (\frac{1}{2} \left (c+\frac{\pi }{2}\right )+\frac{\pi }{4}+\frac{d x}{2}\right ) \sin \left (\frac{c}{2}\right )\right ) \int \frac{\sin \left (\frac{d x}{2}\right )}{x} \, dx\\ &=\cos \left (\frac{c}{2}\right ) \sqrt{a+a \cos (c+d x)} \text{Ci}\left (\frac{d x}{2}\right ) \sec \left (\frac{c}{2}+\frac{d x}{2}\right )-\sqrt{a+a \cos (c+d x)} \sec \left (\frac{c}{2}+\frac{d x}{2}\right ) \sin \left (\frac{c}{2}\right ) \text{Si}\left (\frac{d x}{2}\right )\\ \end{align*}

Mathematica [A]  time = 0.0907398, size = 55, normalized size = 0.65 \[ \sec \left (\frac{1}{2} (c+d x)\right ) \sqrt{a (\cos (c+d x)+1)} \left (\cos \left (\frac{c}{2}\right ) \text{CosIntegral}\left (\frac{d x}{2}\right )-\sin \left (\frac{c}{2}\right ) \text{Si}\left (\frac{d x}{2}\right )\right ) \]

Antiderivative was successfully verified.

[In]

Integrate[Sqrt[a + a*Cos[c + d*x]]/x,x]

[Out]

Sqrt[a*(1 + Cos[c + d*x])]*Sec[(c + d*x)/2]*(Cos[c/2]*CosIntegral[(d*x)/2] - Sin[c/2]*SinIntegral[(d*x)/2])

________________________________________________________________________________________

Maple [F]  time = 0.268, size = 0, normalized size = 0. \begin{align*} \int{\frac{1}{x}\sqrt{a+\cos \left ( dx+c \right ) a}}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int((a+cos(d*x+c)*a)^(1/2)/x,x)

[Out]

int((a+cos(d*x+c)*a)^(1/2)/x,x)

________________________________________________________________________________________

Maxima [C]  time = 2.58361, size = 82, normalized size = 0.98 \begin{align*} -\frac{1}{2} \,{\left ({\left (\sqrt{2} E_{1}\left (\frac{1}{2} i \, d x\right ) + \sqrt{2} E_{1}\left (-\frac{1}{2} i \, d x\right )\right )} \cos \left (\frac{1}{2} \, c\right ) -{\left (i \, \sqrt{2} E_{1}\left (\frac{1}{2} i \, d x\right ) - i \, \sqrt{2} E_{1}\left (-\frac{1}{2} i \, d x\right )\right )} \sin \left (\frac{1}{2} \, c\right )\right )} \sqrt{a} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

-1/2*((sqrt(2)*exp_integral_e(1, 1/2*I*d*x) + sqrt(2)*exp_integral_e(1, -1/2*I*d*x))*cos(1/2*c) - (I*sqrt(2)*e
xp_integral_e(1, 1/2*I*d*x) - I*sqrt(2)*exp_integral_e(1, -1/2*I*d*x))*sin(1/2*c))*sqrt(a)

________________________________________________________________________________________

Fricas [F(-2)]  time = 0., size = 0, normalized size = 0. \begin{align*} \text{Exception raised: UnboundLocalError} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

Exception raised: UnboundLocalError

________________________________________________________________________________________

Sympy [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{\sqrt{a \left (\cos{\left (c + d x \right )} + 1\right )}}{x}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((a+a*cos(d*x+c))**(1/2)/x,x)

[Out]

Integral(sqrt(a*(cos(c + d*x) + 1))/x, x)

________________________________________________________________________________________

Giac [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \frac{\sqrt{a \cos \left (d x + c\right ) + a}}{x}\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

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

[Out]

integrate(sqrt(a*cos(d*x + c) + a)/x, x)