3.103 \(\int \cos (x) \cos (4 x) \, dx\)

Optimal. Leaf size=17 \[ \frac{1}{6} \sin (3 x)+\frac{1}{10} \sin (5 x) \]

[Out]

Sin[3*x]/6 + Sin[5*x]/10

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Rubi [A]  time = 0.0083703, antiderivative size = 17, normalized size of antiderivative = 1., number of steps used = 1, number of rules used = 1, integrand size = 7, \(\frac{\text{number of rules}}{\text{integrand size}}\) = 0.143, Rules used = {4283} \[ \frac{1}{6} \sin (3 x)+\frac{1}{10} \sin (5 x) \]

Antiderivative was successfully verified.

[In]

Int[Cos[x]*Cos[4*x],x]

[Out]

Sin[3*x]/6 + Sin[5*x]/10

Rule 4283

Int[cos[(a_.) + (b_.)*(x_)]*cos[(c_.) + (d_.)*(x_)], x_Symbol] :> Simp[Sin[a - c + (b - d)*x]/(2*(b - d)), x]
+ Simp[Sin[a + c + (b + d)*x]/(2*(b + d)), x] /; FreeQ[{a, b, c, d}, x] && NeQ[b^2 - d^2, 0]

Rubi steps

\begin{align*} \int \cos (x) \cos (4 x) \, dx &=\frac{1}{6} \sin (3 x)+\frac{1}{10} \sin (5 x)\\ \end{align*}

Mathematica [A]  time = 0.0052487, size = 17, normalized size = 1. \[ \frac{1}{6} \sin (3 x)+\frac{1}{10} \sin (5 x) \]

Antiderivative was successfully verified.

[In]

Integrate[Cos[x]*Cos[4*x],x]

[Out]

Sin[3*x]/6 + Sin[5*x]/10

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Maple [A]  time = 0.041, size = 14, normalized size = 0.8 \begin{align*}{\frac{\sin \left ( 3\,x \right ) }{6}}+{\frac{\sin \left ( 5\,x \right ) }{10}} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(cos(x)*cos(4*x),x)

[Out]

1/6*sin(3*x)+1/10*sin(5*x)

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Maxima [A]  time = 1.00794, size = 18, normalized size = 1.06 \begin{align*} \frac{1}{10} \, \sin \left (5 \, x\right ) + \frac{1}{6} \, \sin \left (3 \, x\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(x)*cos(4*x),x, algorithm="maxima")

[Out]

1/10*sin(5*x) + 1/6*sin(3*x)

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Fricas [A]  time = 2.26851, size = 59, normalized size = 3.47 \begin{align*} \frac{1}{15} \,{\left (24 \, \cos \left (x\right )^{4} - 8 \, \cos \left (x\right )^{2} - 1\right )} \sin \left (x\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(x)*cos(4*x),x, algorithm="fricas")

[Out]

1/15*(24*cos(x)^4 - 8*cos(x)^2 - 1)*sin(x)

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Sympy [A]  time = 0.558477, size = 20, normalized size = 1.18 \begin{align*} - \frac{\sin{\left (x \right )} \cos{\left (4 x \right )}}{15} + \frac{4 \sin{\left (4 x \right )} \cos{\left (x \right )}}{15} \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(x)*cos(4*x),x)

[Out]

-sin(x)*cos(4*x)/15 + 4*sin(4*x)*cos(x)/15

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Giac [A]  time = 1.1551, size = 18, normalized size = 1.06 \begin{align*} \frac{1}{10} \, \sin \left (5 \, x\right ) + \frac{1}{6} \, \sin \left (3 \, x\right ) \end{align*}

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(x)*cos(4*x),x, algorithm="giac")

[Out]

1/10*sin(5*x) + 1/6*sin(3*x)