3.30 \(\int \cos (3 x) \cos (4 x) \, dx\)

Optimal. Leaf size=15 \[ \frac {\sin (x)}{2}+\frac {1}{14} \sin (7 x) \]

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Rubi [A]  time = 0.01, antiderivative size = 15, normalized size of antiderivative = 1.00, number of steps used = 1, number of rules used = 1, integrand size = 9, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.111, Rules used = {4283} \[ \frac {\sin (x)}{2}+\frac {1}{14} \sin (7 x) \]

Antiderivative was successfully verified.

[In]

Int[Cos[3*x]*Cos[4*x],x]

[Out]

Sin[x]/2 + Sin[7*x]/14

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 (3 x) \cos (4 x) \, dx &=\frac {\sin (x)}{2}+\frac {1}{14} \sin (7 x)\\ \end {align*}

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Mathematica [A]  time = 0.01, size = 15, normalized size = 1.00 \[ \frac {\sin (x)}{2}+\frac {1}{14} \sin (7 x) \]

Antiderivative was successfully verified.

[In]

Integrate[Cos[3*x]*Cos[4*x],x]

[Out]

Sin[x]/2 + Sin[7*x]/14

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IntegrateAlgebraic [F]  time = 0.00, size = 0, normalized size = 0.00 \[ \int \cos (3 x) \cos (4 x) \, dx \]

Verification is Not applicable to the result.

[In]

IntegrateAlgebraic[Cos[3*x]*Cos[4*x],x]

[Out]

Could not integrate

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fricas [B]  time = 1.09, size = 24, normalized size = 1.60 \[ \frac {1}{7} \, {\left (32 \, \cos \relax (x)^{6} - 40 \, \cos \relax (x)^{4} + 12 \, \cos \relax (x)^{2} + 3\right )} \sin \relax (x) \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(3*x)*cos(4*x),x, algorithm="fricas")

[Out]

1/7*(32*cos(x)^6 - 40*cos(x)^4 + 12*cos(x)^2 + 3)*sin(x)

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giac [A]  time = 0.85, size = 11, normalized size = 0.73 \[ \frac {1}{14} \, \sin \left (7 \, x\right ) + \frac {1}{2} \, \sin \relax (x) \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(3*x)*cos(4*x),x, algorithm="giac")

[Out]

1/14*sin(7*x) + 1/2*sin(x)

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maple [A]  time = 0.14, size = 12, normalized size = 0.80

method	result	size
default	\(\frac {\sin \relax (x )}{2}+\frac {\sin \left (7 x \right )}{14}\)	\(12\)
risch	\(\frac {\sin \relax (x )}{2}+\frac {\sin \left (7 x \right )}{14}\)	\(12\)
norman	\(\frac {-\frac {8 \tan \left (2 x \right ) \left (\tan ^{2}\left (\frac {3 x}{2}\right )\right )}{7}+\frac {6 \left (\tan ^{2}\left (2 x \right )\right ) \tan \left (\frac {3 x}{2}\right )}{7}+\frac {8 \tan \left (2 x \right )}{7}-\frac {6 \tan \left (\frac {3 x}{2}\right )}{7}}{\left (1+\tan ^{2}\left (\frac {3 x}{2}\right )\right ) \left (1+\tan ^{2}\left (2 x \right )\right )}\)	\(59\)

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(cos(3*x)*cos(4*x),x,method=_RETURNVERBOSE)

[Out]

1/2*sin(x)+1/14*sin(7*x)

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maxima [A]  time = 0.43, size = 11, normalized size = 0.73 \[ \frac {1}{14} \, \sin \left (7 \, x\right ) + \frac {1}{2} \, \sin \relax (x) \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(3*x)*cos(4*x),x, algorithm="maxima")

[Out]

1/14*sin(7*x) + 1/2*sin(x)

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mupad [B]  time = 0.06, size = 11, normalized size = 0.73 \[ \frac {\sin \left (7\,x\right )}{14}+\frac {\sin \relax (x)}{2} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

int(cos(3*x)*cos(4*x),x)

[Out]

sin(7*x)/14 + sin(x)/2

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sympy [B]  time = 0.55, size = 26, normalized size = 1.73 \[ - \frac {3 \sin {\left (3 x \right )} \cos {\left (4 x \right )}}{7} + \frac {4 \sin {\left (4 x \right )} \cos {\left (3 x \right )}}{7} \]

Verification of antiderivative is not currently implemented for this CAS.

[In]

integrate(cos(3*x)*cos(4*x),x)

[Out]

-3*sin(3*x)*cos(4*x)/7 + 4*sin(4*x)*cos(3*x)/7

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