3.19 \(\int (c+d x) \cos ^3(a+b x) \, dx\)

Optimal. Leaf size=75 \[ \frac{d \cos ^3(a+b x)}{9 b^2}+\frac{2 d \cos (a+b x)}{3 b^2}+\frac{2 (c+d x) \sin (a+b x)}{3 b}+\frac{(c+d x) \sin (a+b x) \cos ^2(a+b x)}{3 b} \]

[Out]

(2*d*Cos[a + b*x])/(3*b^2) + (d*Cos[a + b*x]^3)/(9*b^2) + (2*(c + d*x)*Sin[a + b*x])/(3*b) + ((c + d*x)*Cos[a
+ b*x]^2*Sin[a + b*x])/(3*b)

________________________________________________________________________________________

Rubi [A]  time = 0.0417872, antiderivative size = 75, normalized size of antiderivative = 1., number of steps used = 3, number of rules used = 3, integrand size = 14, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.214, Rules used = {3310, 3296, 2638} \[ \frac{d \cos ^3(a+b x)}{9 b^2}+\frac{2 d \cos (a+b x)}{3 b^2}+\frac{2 (c+d x) \sin (a+b x)}{3 b}+\frac{(c+d x) \sin (a+b x) \cos ^2(a+b x)}{3 b} \]

Antiderivative was successfully verified.

[In]

Int[(c + d*x)*Cos[a + b*x]^3,x]

[Out]

(2*d*Cos[a + b*x])/(3*b^2) + (d*Cos[a + b*x]^3)/(9*b^2) + (2*(c + d*x)*Sin[a + b*x])/(3*b) + ((c + d*x)*Cos[a
+ b*x]^2*Sin[a + b*x])/(3*b)

Rule 3310

Int[((c_.) + (d_.)*(x_))*((b_.)*sin[(e_.) + (f_.)*(x_)])^(n_), x_Symbol] :> Simp[(d*(b*Sin[e + f*x])^n)/(f^2*n
^2), x] + (Dist[(b^2*(n - 1))/n, Int[(c + d*x)*(b*Sin[e + f*x])^(n - 2), x], x] - Simp[(b*(c + d*x)*Cos[e + f*
x]*(b*Sin[e + f*x])^(n - 1))/(f*n), x]) /; FreeQ[{b, c, d, e, f}, x] && GtQ[n, 1]

Rule 3296

Int[((c_.) + (d_.)*(x_))^(m_.)*sin[(e_.) + (f_.)*(x_)], x_Symbol] :> -Simp[((c + d*x)^m*Cos[e + f*x])/f, x] +
Dist[(d*m)/f, Int[(c + d*x)^(m - 1)*Cos[e + f*x], x], x] /; FreeQ[{c, d, e, f}, x] && GtQ[m, 0]

Rule 2638

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

Rubi steps

\begin{align*} \int (c+d x) \cos ^3(a+b x) \, dx &=\frac{d \cos ^3(a+b x)}{9 b^2}+\frac{(c+d x) \cos ^2(a+b x) \sin (a+b x)}{3 b}+\frac{2}{3} \int (c+d x) \cos (a+b x) \, dx\\ &=\frac{d \cos ^3(a+b x)}{9 b^2}+\frac{2 (c+d x) \sin (a+b x)}{3 b}+\frac{(c+d x) \cos ^2(a+b x) \sin (a+b x)}{3 b}-\frac{(2 d) \int \sin (a+b x) \, dx}{3 b}\\ &=\frac{2 d \cos (a+b x)}{3 b^2}+\frac{d \cos ^3(a+b x)}{9 b^2}+\frac{2 (c+d x) \sin (a+b x)}{3 b}+\frac{(c+d x) \cos ^2(a+b x) \sin (a+b x)}{3 b}\\ \end{align*}

Mathematica [A]  time = 0.164027, size = 52, normalized size = 0.69 \[ \frac{3 b (c+d x) (9 \sin (a+b x)+\sin (3 (a+b x)))+27 d \cos (a+b x)+d \cos (3 (a+b x))}{36 b^2} \]

Antiderivative was successfully verified.

[In]

Integrate[(c + d*x)*Cos[a + b*x]^3,x]

[Out]

(27*d*Cos[a + b*x] + d*Cos[3*(a + b*x)] + 3*b*(c + d*x)*(9*Sin[a + b*x] + Sin[3*(a + b*x)]))/(36*b^2)

________________________________________________________________________________________

Maple [A]  time = 0.027, size = 95, normalized size = 1.3 \begin{align*}{\frac{1}{b} \left ({\frac{d}{b} \left ({\frac{ \left ( bx+a \right ) \left ( 2+ \left ( \cos \left ( bx+a \right ) \right ) ^{2} \right ) \sin \left ( bx+a \right ) }{3}}+{\frac{ \left ( \cos \left ( bx+a \right ) \right ) ^{3}}{9}}+{\frac{2\,\cos \left ( bx+a \right ) }{3}} \right ) }-{\frac{da \left ( 2+ \left ( \cos \left ( bx+a \right ) \right ) ^{2} \right ) \sin \left ( bx+a \right ) }{3\,b}}+{\frac{c \left ( 2+ \left ( \cos \left ( bx+a \right ) \right ) ^{2} \right ) \sin \left ( bx+a \right ) }{3}} \right ) } \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int((d*x+c)*cos(b*x+a)^3,x)

[Out]

1/b*(1/b*d*(1/3*(b*x+a)*(2+cos(b*x+a)^2)*sin(b*x+a)+1/9*cos(b*x+a)^3+2/3*cos(b*x+a))-1/3*a*d/b*(2+cos(b*x+a)^2
)*sin(b*x+a)+1/3*c*(2+cos(b*x+a)^2)*sin(b*x+a))

________________________________________________________________________________________

Maxima [A]  time = 0.996978, size = 139, normalized size = 1.85 \begin{align*} -\frac{12 \,{\left (\sin \left (b x + a\right )^{3} - 3 \, \sin \left (b x + a\right )\right )} c - \frac{12 \,{\left (\sin \left (b x + a\right )^{3} - 3 \, \sin \left (b x + a\right )\right )} a d}{b} - \frac{{\left (3 \,{\left (b x + a\right )} \sin \left (3 \, b x + 3 \, a\right ) + 27 \,{\left (b x + a\right )} \sin \left (b x + a\right ) + \cos \left (3 \, b x + 3 \, a\right ) + 27 \, \cos \left (b x + a\right )\right )} d}{b}}{36 \, b} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((d*x+c)*cos(b*x+a)^3,x, algorithm="maxima")

[Out]

-1/36*(12*(sin(b*x + a)^3 - 3*sin(b*x + a))*c - 12*(sin(b*x + a)^3 - 3*sin(b*x + a))*a*d/b - (3*(b*x + a)*sin(
3*b*x + 3*a) + 27*(b*x + a)*sin(b*x + a) + cos(3*b*x + 3*a) + 27*cos(b*x + a))*d/b)/b

________________________________________________________________________________________

Fricas [A]  time = 1.37993, size = 153, normalized size = 2.04 \begin{align*} \frac{d \cos \left (b x + a\right )^{3} + 6 \, d \cos \left (b x + a\right ) + 3 \,{\left (2 \, b d x +{\left (b d x + b c\right )} \cos \left (b x + a\right )^{2} + 2 \, b c\right )} \sin \left (b x + a\right )}{9 \, b^{2}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((d*x+c)*cos(b*x+a)^3,x, algorithm="fricas")

[Out]

1/9*(d*cos(b*x + a)^3 + 6*d*cos(b*x + a) + 3*(2*b*d*x + (b*d*x + b*c)*cos(b*x + a)^2 + 2*b*c)*sin(b*x + a))/b^
2

________________________________________________________________________________________

Sympy [A]  time = 1.18023, size = 126, normalized size = 1.68 \begin{align*} \begin{cases} \frac{2 c \sin ^{3}{\left (a + b x \right )}}{3 b} + \frac{c \sin{\left (a + b x \right )} \cos ^{2}{\left (a + b x \right )}}{b} + \frac{2 d x \sin ^{3}{\left (a + b x \right )}}{3 b} + \frac{d x \sin{\left (a + b x \right )} \cos ^{2}{\left (a + b x \right )}}{b} + \frac{2 d \sin ^{2}{\left (a + b x \right )} \cos{\left (a + b x \right )}}{3 b^{2}} + \frac{7 d \cos ^{3}{\left (a + b x \right )}}{9 b^{2}} & \text{for}\: b \neq 0 \\\left (c x + \frac{d x^{2}}{2}\right ) \cos ^{3}{\left (a \right )} & \text{otherwise} \end{cases} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((d*x+c)*cos(b*x+a)**3,x)

[Out]

Piecewise((2*c*sin(a + b*x)**3/(3*b) + c*sin(a + b*x)*cos(a + b*x)**2/b + 2*d*x*sin(a + b*x)**3/(3*b) + d*x*si
n(a + b*x)*cos(a + b*x)**2/b + 2*d*sin(a + b*x)**2*cos(a + b*x)/(3*b**2) + 7*d*cos(a + b*x)**3/(9*b**2), Ne(b,
0)), ((c*x + d*x**2/2)*cos(a)**3, True))

________________________________________________________________________________________

Giac [A]  time = 1.19975, size = 93, normalized size = 1.24 \begin{align*} \frac{d \cos \left (3 \, b x + 3 \, a\right )}{36 \, b^{2}} + \frac{3 \, d \cos \left (b x + a\right )}{4 \, b^{2}} + \frac{{\left (b d x + b c\right )} \sin \left (3 \, b x + 3 \, a\right )}{12 \, b^{2}} + \frac{3 \,{\left (b d x + b c\right )} \sin \left (b x + a\right )}{4 \, b^{2}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate((d*x+c)*cos(b*x+a)^3,x, algorithm="giac")

[Out]

1/36*d*cos(3*b*x + 3*a)/b^2 + 3/4*d*cos(b*x + a)/b^2 + 1/12*(b*d*x + b*c)*sin(3*b*x + 3*a)/b^2 + 3/4*(b*d*x +
b*c)*sin(b*x + a)/b^2