Need help to solve one differential equation

In summary, a differential equation is a mathematical equation that describes the relationship between a function and its derivatives. They are important as they can be used to model and study real-life phenomena and complex systems. The methods for solving differential equations depend on the type and order of the equation. While some simple equations can be solved by hand, more complex ones may require the use of computer software or numerical methods. Solving differential equations has various applications in fields such as science, engineering, finance, and biology.
  • #1
TimJ
18
0
Does anybody know how to solve this differential equation:

[tex]
\frac{d^2 \theta}{dt^2}-A\sin(\theta)-
\frac{B^2 \cos(\theta)}{ \sin^3(\theta) }=0
[/tex]

This is an equation that i get from the brachistochronic motion on the surface of a sphere.
 
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  • #2
Welcome to PF!

Hi TimJ! Welcome to PF! :smile:

(have a theta: θ and an omega: ω :wink:)
TimJ said:
[tex]
\frac{d^2 \theta}{dt^2}-A\sin(\theta)-
\frac{B^2 \cos(\theta)}{ \sin^3(\theta) }=0
[/tex]

Try writing d2θ/dt2 = dω/dt = dω/dθ dθ/dt = ω dω/dθ = 1/2 d(ω2)dθ,

so d(ω2)/dθ = 2Asinθ + 2Bcotθcosec2θ :wink:
 
  • #3
Thank you for your help.
 

FAQ: Need help to solve one differential equation

What is a differential equation?

A differential equation is a mathematical equation that relates a function with its derivatives. It describes how a quantity changes over time or in relation to other variables.

Why are differential equations important?

Differential equations are used to model and study various real-life phenomena in physics, engineering, economics, and other fields. They also have applications in understanding and predicting the behavior of complex systems.

How do you solve a differential equation?

There is no one set method for solving all types of differential equations. The approach depends on the type and order of the equation. Some common techniques include separation of variables, substitution, and using a series solution.

Can differential equations be solved by hand?

Some simple differential equations can be solved by hand, but for more complex equations, it is often necessary to use computer software or numerical methods to obtain an approximate solution.

What are the applications of solving differential equations?

Solving differential equations is essential in many fields of science and engineering. It is used to model and understand physical systems, optimize processes, and make predictions about future behavior. It also has applications in finance, biology, and other areas.

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