3.6 \(\int \sin (a+b x) \sin ^2(2 a+2 b x) \, dx\)

Optimal. Leaf size=31 \[ \frac {4 \cos ^5(a+b x)}{5 b}-\frac {4 \cos ^3(a+b x)}{3 b} \]

[Out]

-4/3*cos(b*x+a)^3/b+4/5*cos(b*x+a)^5/b

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Rubi [A]  time = 0.05, antiderivative size = 31, normalized size of antiderivative = 1.00, number of steps used = 4, number of rules used = 3, integrand size = 18, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.167, Rules used = {4288, 2565, 14} \[ \frac {4 \cos ^5(a+b x)}{5 b}-\frac {4 \cos ^3(a+b x)}{3 b} \]

Antiderivative was successfully verified.

[In]

Int[Sin[a + b*x]*Sin[2*a + 2*b*x]^2,x]

[Out]

(-4*Cos[a + b*x]^3)/(3*b) + (4*Cos[a + b*x]^5)/(5*b)

Rule 14

Int[(u_)*((c_.)*(x_))^(m_.), x_Symbol] :> Int[ExpandIntegrand[(c*x)^m*u, x], x] /; FreeQ[{c, m}, x] && SumQ[u]
&&  !LinearQ[u, x] &&  !MatchQ[u, (a_) + (b_.)*(v_) /; FreeQ[{a, b}, x] && InverseFunctionQ[v]]

Rule 2565

Int[(cos[(e_.) + (f_.)*(x_)]*(a_.))^(m_.)*sin[(e_.) + (f_.)*(x_)]^(n_.), x_Symbol] :> -Dist[(a*f)^(-1), Subst[
Int[x^m*(1 - x^2/a^2)^((n - 1)/2), x], x, a*Cos[e + f*x]], x] /; FreeQ[{a, e, f, m}, x] && IntegerQ[(n - 1)/2]
&&  !(IntegerQ[(m - 1)/2] && GtQ[m, 0] && LeQ[m, n])

Rule 4288

Int[((f_.)*sin[(a_.) + (b_.)*(x_)])^(n_.)*sin[(c_.) + (d_.)*(x_)]^(p_.), x_Symbol] :> Dist[2^p/f^p, Int[Cos[a
+ b*x]^p*(f*Sin[a + b*x])^(n + p), x], x] /; FreeQ[{a, b, c, d, f, n}, x] && EqQ[b*c - a*d, 0] && EqQ[d/b, 2]
&& IntegerQ[p]

Rubi steps

\begin {align*} \int \sin (a+b x) \sin ^2(2 a+2 b x) \, dx &=4 \int \cos ^2(a+b x) \sin ^3(a+b x) \, dx\\ &=-\frac {4 \operatorname {Subst}\left (\int x^2 \left (1-x^2\right ) \, dx,x,\cos (a+b x)\right )}{b}\\ &=-\frac {4 \operatorname {Subst}\left (\int \left (x^2-x^4\right ) \, dx,x,\cos (a+b x)\right )}{b}\\ &=-\frac {4 \cos ^3(a+b x)}{3 b}+\frac {4 \cos ^5(a+b x)}{5 b}\\ \end {align*}

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Mathematica [A]  time = 0.07, size = 27, normalized size = 0.87 \[ \frac {2 \cos ^3(a+b x) (3 \cos (2 (a+b x))-7)}{15 b} \]

Antiderivative was successfully verified.

[In]

Integrate[Sin[a + b*x]*Sin[2*a + 2*b*x]^2,x]

[Out]

(2*Cos[a + b*x]^3*(-7 + 3*Cos[2*(a + b*x)]))/(15*b)

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fricas [A]  time = 0.51, size = 26, normalized size = 0.84 \[ \frac {4 \, {\left (3 \, \cos \left (b x + a\right )^{5} - 5 \, \cos \left (b x + a\right )^{3}\right )}}{15 \, b} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(sin(b*x+a)*sin(2*b*x+2*a)^2,x, algorithm="fricas")

[Out]

4/15*(3*cos(b*x + a)^5 - 5*cos(b*x + a)^3)/b

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giac [A]  time = 0.35, size = 40, normalized size = 1.29 \[ \frac {\cos \left (5 \, b x + 5 \, a\right )}{20 \, b} - \frac {\cos \left (3 \, b x + 3 \, a\right )}{12 \, b} - \frac {\cos \left (b x + a\right )}{2 \, b} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(sin(b*x+a)*sin(2*b*x+2*a)^2,x, algorithm="giac")

[Out]

1/20*cos(5*b*x + 5*a)/b - 1/12*cos(3*b*x + 3*a)/b - 1/2*cos(b*x + a)/b

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maple [A]  time = 0.27, size = 41, normalized size = 1.32 \[ -\frac {\cos \left (b x +a \right )}{2 b}-\frac {\cos \left (3 b x +3 a \right )}{12 b}+\frac {\cos \left (5 b x +5 a \right )}{20 b} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(sin(b*x+a)*sin(2*b*x+2*a)^2,x)

[Out]

-1/2*cos(b*x+a)/b-1/12*cos(3*b*x+3*a)/b+1/20*cos(5*b*x+5*a)/b

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maxima [A]  time = 0.34, size = 36, normalized size = 1.16 \[ \frac {3 \, \cos \left (5 \, b x + 5 \, a\right ) - 5 \, \cos \left (3 \, b x + 3 \, a\right ) - 30 \, \cos \left (b x + a\right )}{60 \, b} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(sin(b*x+a)*sin(2*b*x+2*a)^2,x, algorithm="maxima")

[Out]

1/60*(3*cos(5*b*x + 5*a) - 5*cos(3*b*x + 3*a) - 30*cos(b*x + a))/b

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mupad [B]  time = 0.11, size = 26, normalized size = 0.84 \[ -\frac {4\,\left (5\,{\cos \left (a+b\,x\right )}^3-3\,{\cos \left (a+b\,x\right )}^5\right )}{15\,b} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(sin(a + b*x)*sin(2*a + 2*b*x)^2,x)

[Out]

-(4*(5*cos(a + b*x)^3 - 3*cos(a + b*x)^5))/(15*b)

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sympy [A]  time = 3.40, size = 92, normalized size = 2.97 \[ \begin {cases} - \frac {4 \sin {\left (a + b x \right )} \sin {\left (2 a + 2 b x \right )} \cos {\left (2 a + 2 b x \right )}}{15 b} - \frac {7 \sin ^{2}{\left (2 a + 2 b x \right )} \cos {\left (a + b x \right )}}{15 b} - \frac {8 \cos {\left (a + b x \right )} \cos ^{2}{\left (2 a + 2 b x \right )}}{15 b} & \text {for}\: b \neq 0 \\x \sin {\relax (a )} \sin ^{2}{\left (2 a \right )} & \text {otherwise} \end {cases} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(sin(b*x+a)*sin(2*b*x+2*a)**2,x)

[Out]

Piecewise((-4*sin(a + b*x)*sin(2*a + 2*b*x)*cos(2*a + 2*b*x)/(15*b) - 7*sin(2*a + 2*b*x)**2*cos(a + b*x)/(15*b
) - 8*cos(a + b*x)*cos(2*a + 2*b*x)**2/(15*b), Ne(b, 0)), (x*sin(a)*sin(2*a)**2, True))

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