Integrand size = 21, antiderivative size = 78 \[ \int \cos (c+d x) \sqrt {3+4 \cos (c+d x)} \, dx=\frac {\sqrt {7} E\left (\frac {1}{2} (c+d x)|\frac {8}{7}\right )}{2 d}+\frac {\sqrt {7} \operatorname {EllipticF}\left (\frac {1}{2} (c+d x),\frac {8}{7}\right )}{6 d}+\frac {2 \sqrt {3+4 \cos (c+d x)} \sin (c+d x)}{3 d} \]
1/2*(cos(1/2*d*x+1/2*c)^2)^(1/2)/cos(1/2*d*x+1/2*c)*EllipticE(sin(1/2*d*x+ 1/2*c),2/7*14^(1/2))/d*7^(1/2)+1/6*(cos(1/2*d*x+1/2*c)^2)^(1/2)/cos(1/2*d* x+1/2*c)*EllipticF(sin(1/2*d*x+1/2*c),2/7*14^(1/2))/d*7^(1/2)+2/3*sin(d*x+ c)*(3+4*cos(d*x+c))^(1/2)/d
Time = 0.10 (sec) , antiderivative size = 69, normalized size of antiderivative = 0.88 \[ \int \cos (c+d x) \sqrt {3+4 \cos (c+d x)} \, dx=\frac {3 \sqrt {7} E\left (\frac {1}{2} (c+d x)|\frac {8}{7}\right )+\sqrt {7} \operatorname {EllipticF}\left (\frac {1}{2} (c+d x),\frac {8}{7}\right )+4 \sqrt {3+4 \cos (c+d x)} \sin (c+d x)}{6 d} \]
(3*Sqrt[7]*EllipticE[(c + d*x)/2, 8/7] + Sqrt[7]*EllipticF[(c + d*x)/2, 8/ 7] + 4*Sqrt[3 + 4*Cos[c + d*x]]*Sin[c + d*x])/(6*d)
Time = 0.43 (sec) , antiderivative size = 83, normalized size of antiderivative = 1.06, number of steps used = 8, number of rules used = 8, \(\frac {\text {number of rules}}{\text {integrand size}}\) = 0.381, Rules used = {3042, 3232, 27, 3042, 3231, 3042, 3132, 3140}
Below are the steps used by Rubi to obtain the solution. The rule number used for the transformation is given above next to the arrow. The rules definitions used are listed below.
\(\displaystyle \int \cos (c+d x) \sqrt {4 \cos (c+d x)+3} \, dx\) |
\(\Big \downarrow \) 3042 |
\(\displaystyle \int \sin \left (c+d x+\frac {\pi }{2}\right ) \sqrt {4 \sin \left (c+d x+\frac {\pi }{2}\right )+3}dx\) |
\(\Big \downarrow \) 3232 |
\(\displaystyle \frac {2}{3} \int \frac {3 \cos (c+d x)+4}{2 \sqrt {4 \cos (c+d x)+3}}dx+\frac {2 \sin (c+d x) \sqrt {4 \cos (c+d x)+3}}{3 d}\) |
\(\Big \downarrow \) 27 |
\(\displaystyle \frac {1}{3} \int \frac {3 \cos (c+d x)+4}{\sqrt {4 \cos (c+d x)+3}}dx+\frac {2 \sin (c+d x) \sqrt {4 \cos (c+d x)+3}}{3 d}\) |
\(\Big \downarrow \) 3042 |
\(\displaystyle \frac {1}{3} \int \frac {3 \sin \left (c+d x+\frac {\pi }{2}\right )+4}{\sqrt {4 \sin \left (c+d x+\frac {\pi }{2}\right )+3}}dx+\frac {2 \sin (c+d x) \sqrt {4 \cos (c+d x)+3}}{3 d}\) |
\(\Big \downarrow \) 3231 |
\(\displaystyle \frac {1}{3} \left (\frac {7}{4} \int \frac {1}{\sqrt {4 \cos (c+d x)+3}}dx+\frac {3}{4} \int \sqrt {4 \cos (c+d x)+3}dx\right )+\frac {2 \sin (c+d x) \sqrt {4 \cos (c+d x)+3}}{3 d}\) |
\(\Big \downarrow \) 3042 |
\(\displaystyle \frac {1}{3} \left (\frac {7}{4} \int \frac {1}{\sqrt {4 \sin \left (c+d x+\frac {\pi }{2}\right )+3}}dx+\frac {3}{4} \int \sqrt {4 \sin \left (c+d x+\frac {\pi }{2}\right )+3}dx\right )+\frac {2 \sin (c+d x) \sqrt {4 \cos (c+d x)+3}}{3 d}\) |
\(\Big \downarrow \) 3132 |
\(\displaystyle \frac {1}{3} \left (\frac {7}{4} \int \frac {1}{\sqrt {4 \sin \left (c+d x+\frac {\pi }{2}\right )+3}}dx+\frac {3 \sqrt {7} E\left (\frac {1}{2} (c+d x)|\frac {8}{7}\right )}{2 d}\right )+\frac {2 \sin (c+d x) \sqrt {4 \cos (c+d x)+3}}{3 d}\) |
\(\Big \downarrow \) 3140 |
\(\displaystyle \frac {2 \sin (c+d x) \sqrt {4 \cos (c+d x)+3}}{3 d}+\frac {1}{3} \left (\frac {\sqrt {7} \operatorname {EllipticF}\left (\frac {1}{2} (c+d x),\frac {8}{7}\right )}{2 d}+\frac {3 \sqrt {7} E\left (\frac {1}{2} (c+d x)|\frac {8}{7}\right )}{2 d}\right )\) |
((3*Sqrt[7]*EllipticE[(c + d*x)/2, 8/7])/(2*d) + (Sqrt[7]*EllipticF[(c + d *x)/2, 8/7])/(2*d))/3 + (2*Sqrt[3 + 4*Cos[c + d*x]]*Sin[c + d*x])/(3*d)
3.6.11.3.1 Defintions of rubi rules used
Int[(a_)*(Fx_), x_Symbol] :> Simp[a Int[Fx, x], x] /; FreeQ[a, x] && !Ma tchQ[Fx, (b_)*(Gx_) /; FreeQ[b, x]]
Int[Sqrt[(a_) + (b_.)*sin[(c_.) + (d_.)*(x_)]], x_Symbol] :> Simp[2*(Sqrt[a + b]/d)*EllipticE[(1/2)*(c - Pi/2 + d*x), 2*(b/(a + b))], x] /; FreeQ[{a, b, c, d}, x] && NeQ[a^2 - b^2, 0] && GtQ[a + b, 0]
Int[1/Sqrt[(a_) + (b_.)*sin[(c_.) + (d_.)*(x_)]], x_Symbol] :> Simp[(2/(d*S qrt[a + b]))*EllipticF[(1/2)*(c - Pi/2 + d*x), 2*(b/(a + b))], x] /; FreeQ[ {a, b, c, d}, x] && NeQ[a^2 - b^2, 0] && GtQ[a + b, 0]
Int[((c_.) + (d_.)*sin[(e_.) + (f_.)*(x_)])/Sqrt[(a_) + (b_.)*sin[(e_.) + ( f_.)*(x_)]], x_Symbol] :> Simp[(b*c - a*d)/b Int[1/Sqrt[a + b*Sin[e + f*x ]], x], x] + Simp[d/b Int[Sqrt[a + b*Sin[e + f*x]], x], x] /; FreeQ[{a, b , c, d, e, f}, x] && NeQ[b*c - a*d, 0] && NeQ[a^2 - b^2, 0]
Int[((a_) + (b_.)*sin[(e_.) + (f_.)*(x_)])^(m_)*((c_.) + (d_.)*sin[(e_.) + (f_.)*(x_)]), x_Symbol] :> Simp[(-d)*Cos[e + f*x]*((a + b*Sin[e + f*x])^m/( f*(m + 1))), x] + Simp[1/(m + 1) Int[(a + b*Sin[e + f*x])^(m - 1)*Simp[b* d*m + a*c*(m + 1) + (a*d*m + b*c*(m + 1))*Sin[e + f*x], x], x], x] /; FreeQ [{a, b, c, d, e, f}, x] && NeQ[b*c - a*d, 0] && NeQ[a^2 - b^2, 0] && GtQ[m, 0] && IntegerQ[2*m]
Time = 2.73 (sec) , antiderivative size = 231, normalized size of antiderivative = 2.96
method | result | size |
default | \(-\frac {\sqrt {\left (8 \left (\cos ^{2}\left (\frac {d x}{2}+\frac {c}{2}\right )\right )-1\right ) \left (\sin ^{2}\left (\frac {d x}{2}+\frac {c}{2}\right )\right )}\, \left (64 \left (\sin ^{4}\left (\frac {d x}{2}+\frac {c}{2}\right )\right ) \cos \left (\frac {d x}{2}+\frac {c}{2}\right )-56 \left (\sin ^{2}\left (\frac {d x}{2}+\frac {c}{2}\right )\right ) \cos \left (\frac {d x}{2}+\frac {c}{2}\right )+7 \sqrt {\frac {1}{2}-\frac {\cos \left (d x +c \right )}{2}}\, \sqrt {8 \left (\sin ^{2}\left (\frac {d x}{2}+\frac {c}{2}\right )\right )-7}\, F\left (\cos \left (\frac {d x}{2}+\frac {c}{2}\right ), 2 \sqrt {2}\right )-3 \sqrt {\frac {1}{2}-\frac {\cos \left (d x +c \right )}{2}}\, \sqrt {8 \left (\sin ^{2}\left (\frac {d x}{2}+\frac {c}{2}\right )\right )-7}\, E\left (\cos \left (\frac {d x}{2}+\frac {c}{2}\right ), 2 \sqrt {2}\right )\right )}{6 \sqrt {-8 \left (\sin ^{4}\left (\frac {d x}{2}+\frac {c}{2}\right )\right )+7 \left (\sin ^{2}\left (\frac {d x}{2}+\frac {c}{2}\right )\right )}\, \sin \left (\frac {d x}{2}+\frac {c}{2}\right ) \sqrt {8 \left (\cos ^{2}\left (\frac {d x}{2}+\frac {c}{2}\right )\right )-1}\, d}\) | \(231\) |
-1/6*((8*cos(1/2*d*x+1/2*c)^2-1)*sin(1/2*d*x+1/2*c)^2)^(1/2)*(64*sin(1/2*d *x+1/2*c)^4*cos(1/2*d*x+1/2*c)-56*sin(1/2*d*x+1/2*c)^2*cos(1/2*d*x+1/2*c)+ 7*(sin(1/2*d*x+1/2*c)^2)^(1/2)*(8*sin(1/2*d*x+1/2*c)^2-7)^(1/2)*EllipticF( cos(1/2*d*x+1/2*c),2*2^(1/2))-3*(sin(1/2*d*x+1/2*c)^2)^(1/2)*(8*sin(1/2*d* x+1/2*c)^2-7)^(1/2)*EllipticE(cos(1/2*d*x+1/2*c),2*2^(1/2)))/(-8*sin(1/2*d *x+1/2*c)^4+7*sin(1/2*d*x+1/2*c)^2)^(1/2)/sin(1/2*d*x+1/2*c)/(8*cos(1/2*d* x+1/2*c)^2-1)^(1/2)/d
Result contains higher order function than in optimal. Order 9 vs. order 4.
Time = 0.10 (sec) , antiderivative size = 128, normalized size of antiderivative = 1.64 \[ \int \cos (c+d x) \sqrt {3+4 \cos (c+d x)} \, dx=\frac {8 \, \sqrt {4 \, \cos \left (d x + c\right ) + 3} \sin \left (d x + c\right ) - 5 i \, \sqrt {2} {\rm weierstrassPInverse}\left (-1, 1, \cos \left (d x + c\right ) + i \, \sin \left (d x + c\right ) + \frac {1}{2}\right ) + 5 i \, \sqrt {2} {\rm weierstrassPInverse}\left (-1, 1, \cos \left (d x + c\right ) - i \, \sin \left (d x + c\right ) + \frac {1}{2}\right ) + 6 i \, \sqrt {2} {\rm weierstrassZeta}\left (-1, 1, {\rm weierstrassPInverse}\left (-1, 1, \cos \left (d x + c\right ) + i \, \sin \left (d x + c\right ) + \frac {1}{2}\right )\right ) - 6 i \, \sqrt {2} {\rm weierstrassZeta}\left (-1, 1, {\rm weierstrassPInverse}\left (-1, 1, \cos \left (d x + c\right ) - i \, \sin \left (d x + c\right ) + \frac {1}{2}\right )\right )}{12 \, d} \]
1/12*(8*sqrt(4*cos(d*x + c) + 3)*sin(d*x + c) - 5*I*sqrt(2)*weierstrassPIn verse(-1, 1, cos(d*x + c) + I*sin(d*x + c) + 1/2) + 5*I*sqrt(2)*weierstras sPInverse(-1, 1, cos(d*x + c) - I*sin(d*x + c) + 1/2) + 6*I*sqrt(2)*weiers trassZeta(-1, 1, weierstrassPInverse(-1, 1, cos(d*x + c) + I*sin(d*x + c) + 1/2)) - 6*I*sqrt(2)*weierstrassZeta(-1, 1, weierstrassPInverse(-1, 1, co s(d*x + c) - I*sin(d*x + c) + 1/2)))/d
\[ \int \cos (c+d x) \sqrt {3+4 \cos (c+d x)} \, dx=\int \sqrt {4 \cos {\left (c + d x \right )} + 3} \cos {\left (c + d x \right )}\, dx \]
\[ \int \cos (c+d x) \sqrt {3+4 \cos (c+d x)} \, dx=\int { \sqrt {4 \, \cos \left (d x + c\right ) + 3} \cos \left (d x + c\right ) \,d x } \]
\[ \int \cos (c+d x) \sqrt {3+4 \cos (c+d x)} \, dx=\int { \sqrt {4 \, \cos \left (d x + c\right ) + 3} \cos \left (d x + c\right ) \,d x } \]
Timed out. \[ \int \cos (c+d x) \sqrt {3+4 \cos (c+d x)} \, dx=\int \cos \left (c+d\,x\right )\,\sqrt {4\,\cos \left (c+d\,x\right )+3} \,d x \]