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Question: How to obtain this solution using dsolve?

Question:How to obtain this solution using dsolve?

nm 11398 Maple 2025
dsolve
4 hours ago
0

Maple 2025.1 unable to solve this ode. Sympy gives the following two solutions which Maples verifies are correct.

Any trick or option that can help dsolve find these solutions?
 

> 

interface(version);

`Standard Worksheet Interface, Maple 2025.1, Linux, June 12 2025 Build ID 1932578`

> 

restart;
> 

ode:=diff(y(x),x) = (1+cos(x)*sin(y(x)))*tan(y(x));

diff(y(x), x) = (1+cos(x)*sin(y(x)))*tan(y(x))

> 

sol:=dsolve(ode);

> 

sol_1:=y(x)=arcsin( 2*exp(x) / ( c__1 + sqrt(2)*exp(x) * sin(x+Pi/4) ) ) + Pi

y(x) = arcsin(2*exp(x)/(c__1+2^(1/2)*exp(x)*sin(x+(1/4)*Pi)))+Pi

> 

odetest(sol_1,ode)

0

> 

sol_2:=y(x)=arcsin( 2*exp(x) / ( c__1 - sqrt(2)*exp(x) * sin(x+Pi/4) ) ) ;

y(x) = arcsin(2*exp(x)/(c__1-2^(1/2)*exp(x)*sin(x+(1/4)*Pi)))

> 

odetest(sol_2,ode)

0

> 

 


 

Download How_to_find_solution_sept_20_2025.mw

update:

OK, found out how. Needed transformation u(x)=sin(y(x)). Maple probably did not have this in one of the things to try.

 

> 

restart;
> 

ode:=diff(y(x),x) = (1+cos(x)*sin(y(x)))*tan(y(x));
sol:=dsolve(ode);

diff(y(x), x) = (1+cos(x)*sin(y(x)))*tan(y(x))

> 

tr:=y(x)=arcsin(u(x));
PDEtools:-dchange(tr,ode,[u(x)]):
dsolve(%);
sol:=y(x)=arcsin(rhs(%));
odetest(sol,ode)
 

y(x) = arcsin(u(x))

u(x) = -2/(-2*exp(-x)*c__1+sin(x)+cos(x))

y(x) = -arcsin(2/(-2*exp(-x)*c__1+sin(x)+cos(x)))

0


 

Download How_to_find_solution_sept_20_2025_V2.mw

 

 
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