Optimal. Leaf size=33 \[ \frac {\sin ^{-1}\left (\sqrt {2} \sin (x)\right )}{2 \sqrt {2}}+\frac {1}{2} \sqrt {\cos (2 x)} \sin (x) \]
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Rubi [A]
time = 0.02, antiderivative size = 33, normalized size of antiderivative = 1.00, number of steps
used = 3, number of rules used = 3, integrand size = 11, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.273, Rules used = {4441, 201, 222}
\begin {gather*} \frac {\text {ArcSin}\left (\sqrt {2} \sin (x)\right )}{2 \sqrt {2}}+\frac {1}{2} \sin (x) \sqrt {\cos (2 x)} \end {gather*}
Antiderivative was successfully verified.
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Rule 201
Rule 222
Rule 4441
Rubi steps
\begin {align*} \int \cos (x) \sqrt {\cos (2 x)} \, dx &=\text {Subst}\left (\int \sqrt {1-2 x^2} \, dx,x,\sin (x)\right )\\ &=\frac {1}{2} \sqrt {\cos (2 x)} \sin (x)+\frac {1}{2} \text {Subst}\left (\int \frac {1}{\sqrt {1-2 x^2}} \, dx,x,\sin (x)\right )\\ &=\frac {\sin ^{-1}\left (\sqrt {2} \sin (x)\right )}{2 \sqrt {2}}+\frac {1}{2} \sqrt {\cos (2 x)} \sin (x)\\ \end {align*}
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Mathematica [A]
time = 0.01, size = 32, normalized size = 0.97 \begin {gather*} \frac {1}{4} \left (\sqrt {2} \sin ^{-1}\left (\sqrt {2} \sin (x)\right )+2 \sqrt {\cos (2 x)} \sin (x)\right ) \end {gather*}
Antiderivative was successfully verified.
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Maple [B] Leaf count of result is larger than twice the leaf count of optimal. \(61\) vs.
\(2(23)=46\).
time = 0.15, size = 62, normalized size = 1.88
method | result | size |
default | \(-\frac {\sqrt {\left (2 \left (\cos ^{2}\left (x \right )\right )-1\right ) \left (\sin ^{2}\left (x \right )\right )}\, \left (-\sqrt {2}\, \arcsin \left (4 \left (\sin ^{2}\left (x \right )\right )-1\right )-4 \sqrt {-2 \left (\sin ^{4}\left (x \right )\right )+\sin ^{2}\left (x \right )}\right )}{8 \sin \left (x \right ) \sqrt {2 \left (\cos ^{2}\left (x \right )\right )-1}}\) | \(62\) |
Verification of antiderivative is not currently implemented for this CAS.
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Maxima [B] Leaf count of result is larger than twice the leaf count of optimal. 488 vs.
\(2 (23) = 46\).
time = 3.03, size = 488, normalized size = 14.79 \begin {gather*} \frac {1}{16} \, \sqrt {2} {\left (2 \, {\left (\cos \left (4 \, x\right )^{2} + \sin \left (4 \, x\right )^{2} + 2 \, \cos \left (4 \, x\right ) + 1\right )}^{\frac {1}{4}} {\left (\cos \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right ) \sin \left (2 \, x\right ) - {\left (\cos \left (2 \, x\right ) - 1\right )} \sin \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right )\right )} + \arctan \left (-{\left (\cos \left (4 \, x\right )^{2} + \sin \left (4 \, x\right )^{2} + 2 \, \cos \left (4 \, x\right ) + 1\right )}^{\frac {1}{4}} {\left (\cos \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right ) \sin \left (2 \, x\right ) - \cos \left (2 \, x\right ) \sin \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right )\right )}, {\left (\cos \left (4 \, x\right )^{2} + \sin \left (4 \, x\right )^{2} + 2 \, \cos \left (4 \, x\right ) + 1\right )}^{\frac {1}{4}} {\left (\cos \left (2 \, x\right ) \cos \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right ) + \sin \left (2 \, x\right ) \sin \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right )\right )} + 1\right ) - \arctan \left (-{\left (\cos \left (4 \, x\right )^{2} + \sin \left (4 \, x\right )^{2} + 2 \, \cos \left (4 \, x\right ) + 1\right )}^{\frac {1}{4}} {\left (\cos \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right ) \sin \left (2 \, x\right ) - \cos \left (2 \, x\right ) \sin \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right )\right )}, {\left (\cos \left (4 \, x\right )^{2} + \sin \left (4 \, x\right )^{2} + 2 \, \cos \left (4 \, x\right ) + 1\right )}^{\frac {1}{4}} {\left (\cos \left (2 \, x\right ) \cos \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right ) + \sin \left (2 \, x\right ) \sin \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right )\right )} - 1\right ) - \arctan \left ({\left (\cos \left (4 \, x\right )^{2} + \sin \left (4 \, x\right )^{2} + 2 \, \cos \left (4 \, x\right ) + 1\right )}^{\frac {1}{4}} \sin \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right ), {\left (\cos \left (4 \, x\right )^{2} + \sin \left (4 \, x\right )^{2} + 2 \, \cos \left (4 \, x\right ) + 1\right )}^{\frac {1}{4}} \cos \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right ) + 1\right ) + \arctan \left ({\left (\cos \left (4 \, x\right )^{2} + \sin \left (4 \, x\right )^{2} + 2 \, \cos \left (4 \, x\right ) + 1\right )}^{\frac {1}{4}} \sin \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right ), {\left (\cos \left (4 \, x\right )^{2} + \sin \left (4 \, x\right )^{2} + 2 \, \cos \left (4 \, x\right ) + 1\right )}^{\frac {1}{4}} \cos \left (\frac {1}{2} \, \arctan \left (\sin \left (4 \, x\right ), \cos \left (4 \, x\right ) + 1\right )\right ) - 1\right )\right )} \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Fricas [B] Leaf count of result is larger than twice the leaf count of optimal. 77 vs.
\(2 (23) = 46\).
time = 1.18, size = 77, normalized size = 2.33 \begin {gather*} -\frac {1}{16} \, \sqrt {2} \arctan \left (\frac {{\left (32 \, \sqrt {2} \cos \left (x\right )^{4} - 48 \, \sqrt {2} \cos \left (x\right )^{2} + 17 \, \sqrt {2}\right )} \sqrt {2 \, \cos \left (x\right )^{2} - 1}}{8 \, {\left (8 \, \cos \left (x\right )^{4} - 10 \, \cos \left (x\right )^{2} + 3\right )} \sin \left (x\right )}\right ) + \frac {1}{2} \, \sqrt {2 \, \cos \left (x\right )^{2} - 1} \sin \left (x\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Sympy [F]
time = 0.00, size = 0, normalized size = 0.00 \begin {gather*} \int \cos {\left (x \right )} \sqrt {\cos {\left (2 x \right )}}\, dx \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Giac [A]
time = 1.12, size = 27, normalized size = 0.82 \begin {gather*} \frac {1}{4} \, \sqrt {2} \arcsin \left (\sqrt {2} \sin \left (x\right )\right ) + \frac {1}{2} \, \sqrt {-2 \, \sin \left (x\right )^{2} + 1} \sin \left (x\right ) \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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Mupad [F]
time = 0.00, size = -1, normalized size = -0.03 \begin {gather*} \int \sqrt {\cos \left (2\,x\right )}\,\cos \left (x\right ) \,d x \end {gather*}
Verification of antiderivative is not currently implemented for this CAS.
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