3.129 \(\int \cos (a+b x) \text{CosIntegral}(a+b x) \, dx\)

Optimal. Leaf size=33 \[ \frac{\text{CosIntegral}(a+b x) \sin (a+b x)}{b}-\frac{\text{Si}(2 a+2 b x)}{2 b} \]

[Out]

(CosIntegral[a + b*x]*Sin[a + b*x])/b - SinIntegral[2*a + 2*b*x]/(2*b)

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Rubi [A]  time = 0.0562818, antiderivative size = 33, normalized size of antiderivative = 1., number of steps used = 4, number of rules used = 4, integrand size = 13, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.308, Rules used = {6512, 4406, 12, 3299} \[ \frac{\text{CosIntegral}(a+b x) \sin (a+b x)}{b}-\frac{\text{Si}(2 a+2 b x)}{2 b} \]

Antiderivative was successfully verified.

[In]

Int[Cos[a + b*x]*CosIntegral[a + b*x],x]

[Out]

(CosIntegral[a + b*x]*Sin[a + b*x])/b - SinIntegral[2*a + 2*b*x]/(2*b)

Rule 6512

Int[Cos[(a_.) + (b_.)*(x_)]*CosIntegral[(c_.) + (d_.)*(x_)], x_Symbol] :> Simp[(Sin[a + b*x]*CosIntegral[c + d
*x])/b, x] - Dist[d/b, Int[(Sin[a + b*x]*Cos[c + d*x])/(c + d*x), x], x] /; FreeQ[{a, b, c, d}, x]

Rule 4406

Int[Cos[(a_.) + (b_.)*(x_)]^(p_.)*((c_.) + (d_.)*(x_))^(m_.)*Sin[(a_.) + (b_.)*(x_)]^(n_.), x_Symbol] :> Int[E
xpandTrigReduce[(c + d*x)^m, Sin[a + b*x]^n*Cos[a + b*x]^p, x], x] /; FreeQ[{a, b, c, d, m}, x] && IGtQ[n, 0]
&& IGtQ[p, 0]

Rule 12

Int[(a_)*(u_), x_Symbol] :> Dist[a, Int[u, x], x] /; FreeQ[a, x] &&  !MatchQ[u, (b_)*(v_) /; FreeQ[b, x]]

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]

Rubi steps

\begin{align*} \int \cos (a+b x) \text{Ci}(a+b x) \, dx &=\frac{\text{Ci}(a+b x) \sin (a+b x)}{b}-\int \frac{\cos (a+b x) \sin (a+b x)}{a+b x} \, dx\\ &=\frac{\text{Ci}(a+b x) \sin (a+b x)}{b}-\int \frac{\sin (2 a+2 b x)}{2 (a+b x)} \, dx\\ &=\frac{\text{Ci}(a+b x) \sin (a+b x)}{b}-\frac{1}{2} \int \frac{\sin (2 a+2 b x)}{a+b x} \, dx\\ &=\frac{\text{Ci}(a+b x) \sin (a+b x)}{b}-\frac{\text{Si}(2 a+2 b x)}{2 b}\\ \end{align*}

Mathematica [A]  time = 0.0187926, size = 32, normalized size = 0.97 \[ \frac{\text{CosIntegral}(a+b x) \sin (a+b x)}{b}-\frac{\text{Si}(2 (a+b x))}{2 b} \]

Antiderivative was successfully verified.

[In]

Integrate[Cos[a + b*x]*CosIntegral[a + b*x],x]

[Out]

(CosIntegral[a + b*x]*Sin[a + b*x])/b - SinIntegral[2*(a + b*x)]/(2*b)

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Maple [A]  time = 0.053, size = 30, normalized size = 0.9 \begin{align*}{\frac{1}{b} \left ({\it Ci} \left ( bx+a \right ) \sin \left ( bx+a \right ) -{\frac{{\it Si} \left ( 2\,bx+2\,a \right ) }{2}} \right ) } \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(Ci(b*x+a)*cos(b*x+a),x)

[Out]

1/b*(Ci(b*x+a)*sin(b*x+a)-1/2*Si(2*b*x+2*a))

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Maxima [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int{\rm Ci}\left (b x + a\right ) \cos \left (b x + a\right )\,{d x} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(Ci(b*x+a)*cos(b*x+a),x, algorithm="maxima")

[Out]

integrate(Ci(b*x + a)*cos(b*x + a), x)

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Fricas [F]  time = 0., size = 0, normalized size = 0. \begin{align*}{\rm integral}\left (\cos \left (b x + a\right ) \operatorname{Ci}\left (b x + a\right ), x\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(Ci(b*x+a)*cos(b*x+a),x, algorithm="fricas")

[Out]

integral(cos(b*x + a)*cos_integral(b*x + a), x)

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Sympy [F]  time = 0., size = 0, normalized size = 0. \begin{align*} \int \cos{\left (a + b x \right )} \operatorname{Ci}{\left (a + b x \right )}\, dx \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(Ci(b*x+a)*cos(b*x+a),x)

[Out]

Integral(cos(a + b*x)*Ci(a + b*x), x)

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Giac [C]  time = 1.16471, size = 76, normalized size = 2.3 \begin{align*} \frac{\operatorname{Ci}\left (b x + a\right ) \sin \left (b x + a\right )}{b} - \frac{\Im \left ( \operatorname{Ci}\left (2 \, b x + 2 \, a\right ) \right ) - \Im \left ( \operatorname{Ci}\left (-2 \, b x - 2 \, a\right ) \right ) + 2 \, \operatorname{Si}\left (2 \, b x + 2 \, a\right )}{4 \, b} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(Ci(b*x+a)*cos(b*x+a),x, algorithm="giac")

[Out]

cos_integral(b*x + a)*sin(b*x + a)/b - 1/4*(imag_part(cos_integral(2*b*x + 2*a)) - imag_part(cos_integral(-2*b
*x - 2*a)) + 2*sin_integral(2*b*x + 2*a))/b