60.1.359 problem 360
Internal
problem
ID
[10373]
Book
:
Differential
Gleichungen,
E.
Kamke,
3rd
ed.
Chelsea
Pub.
NY,
1948
Section
:
Chapter
1,
linear
first
order
Problem
number
:
360
Date
solved
:
Monday, January 27, 2025 at 07:35:18 PM
CAS
classification
:
[_quadrature]
\begin{align*} y^{\prime } \cos \left (a y\right )-b \left (1-c \cos \left (a y\right )\right ) \sqrt {\cos \left (a y\right )^{2}-1+c \cos \left (a y\right )}&=0 \end{align*}
✓ Solution by Maple
Time used: 0.003 (sec). Leaf size: 50
dsolve(diff(y(x),x)*cos(a*y(x))-b*(1-c*cos(a*y(x)))*(cos(a*y(x))^2-1+c*cos(a*y(x)))^(1/2) = 0,y(x), singsol=all)
\[
\frac {\int _{}^{y}\frac {\cos \left (\textit {\_a} a \right )}{\sqrt {c \cos \left (\textit {\_a} a \right )-\sin \left (\textit {\_a} a \right )^{2}}\, \left (c \cos \left (\textit {\_a} a \right )-1\right )}d \textit {\_a} +\left (x +c_{1} \right ) b}{b} = 0
\]
✓ Solution by Mathematica
Time used: 28.015 (sec). Leaf size: 504
DSolve[-(b*(1 - c*Cos[a*y[x]])*Sqrt[-1 + c*Cos[a*y[x]] + Cos[a*y[x]]^2]) + Cos[a*y[x]]*D[y[x],x]==0,y[x],x,IncludeSingularSolutions -> True]
\begin{align*}
y(x)\to \text {InverseFunction}\left [-\frac {i (\cos (\text {$\#$1} a)+1) \sqrt {\frac {2 c \cos (\text {$\#$1} a)+\cos (2 \text {$\#$1} a)-1}{(\cos (\text {$\#$1} a)+1)^2}} \sqrt {\frac {c \tan ^2\left (\frac {\text {$\#$1} a}{2}\right )+\sqrt {c^2+4}+2}{\sqrt {c^2+4}+2}} \sqrt {1-\frac {c \tan ^2\left (\frac {\text {$\#$1} a}{2}\right )}{\sqrt {c^2+4}-2}} \left ((c-1) \operatorname {EllipticF}\left (i \text {arcsinh}\left (\sqrt {-\frac {c}{\sqrt {c^2+4}-2}} \tan \left (\frac {a \text {$\#$1}}{2}\right )\right ),\frac {2-\sqrt {c^2+4}}{\sqrt {c^2+4}+2}\right )+2 \operatorname {EllipticPi}\left (\frac {(c+1) \left (\sqrt {c^2+4}-2\right )}{(c-1) c},i \text {arcsinh}\left (\sqrt {-\frac {c}{\sqrt {c^2+4}-2}} \tan \left (\frac {a \text {$\#$1}}{2}\right )\right ),\frac {2-\sqrt {c^2+4}}{\sqrt {c^2+4}+2}\right )\right )}{a \left (c^2-1\right ) \sqrt {\frac {c}{4-2 \sqrt {c^2+4}}} \sqrt {2 c \cos (\text {$\#$1} a)+\cos (2 \text {$\#$1} a)-1} \sqrt {-c \tan ^4\left (\frac {\text {$\#$1} a}{2}\right )-4 \tan ^2\left (\frac {\text {$\#$1} a}{2}\right )+c}}\&\right ]\left [-\frac {b x}{\sqrt {2}}+c_1\right ] \\
y(x)\to -\frac {\arccos \left (\frac {1}{c}\right )}{a} \\
y(x)\to \frac {\arccos \left (\frac {1}{c}\right )}{a} \\
y(x)\to -\frac {\arccos \left (\frac {1}{2} \left (-\sqrt {c^2+4}-c\right )\right )}{a} \\
y(x)\to \frac {\arccos \left (\frac {1}{2} \left (-\sqrt {c^2+4}-c\right )\right )}{a} \\
y(x)\to -\frac {\arccos \left (\frac {1}{2} \left (\sqrt {c^2+4}-c\right )\right )}{a} \\
y(x)\to \frac {\arccos \left (\frac {1}{2} \left (\sqrt {c^2+4}-c\right )\right )}{a} \\
\end{align*}