How do I solve these differential equations?

Thread starter ph_xdf
Start date Sep 1, 2019
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Differential Differential equations

In summary, a differential equation is a mathematical equation that relates the values of a function to its derivatives and is used to model physical phenomena. There are various methods for solving differential equations, each with its own characteristics and applicability depending on the type of equation and initial conditions. While some differential equations can be solved analytically, others require numerical methods. There are two types of differential equations - ordinary and partial - which describe the behavior of a single variable over time and multiple variables in space and time, respectively. Differential equations have numerous applications in science, such as in physics, engineering, biology, and economics, to model and understand various phenomena.

Sep 1, 2019

ph_xdf

Homework Statement: How do I solve these differential equations?

Relevant Equations: $$\frac{dy}{dx} = \frac{1}{2 \alpha \beta} - \frac{\cos(x)}{2 \beta \sin(y)} $$

$$\frac{\partial f (x,t)}{\partial t} - \alpha \beta \frac{\partial f (x,t)}{\partial x} \cos(x)+\alpha \beta \sin(x) f (x,t) =0 $$

$$\frac{\partial f (x,t)}{\partial t} - \alpha \beta \frac{\partial f (x,t)}{\partial x} (x- \frac{3 \pi}{2})-\alpha \beta f (x,t) =0$$

For the first and second, I don't know if there is an analytical solution.
The third I believe can only be solved with: $$ f(x,t)=c e^{\alpha \beta t}$$

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Sep 2, 2019

HallsofIvy

Science Advisor

Homework Helper

The second and third, as they are written, are not even equations! Was the first "-" in each supposed to be "="?

Sep 2, 2019

ph_xdf

No, the second and the third are equal to zero and I can see it

Related to How do I solve these differential equations?

1. How do I know which method to use for solving a differential equation?

There are several methods for solving differential equations, including separation of variables, integrating factors, and using power series. The method you should use depends on the type of differential equation and its order. It is important to identify the type and order of the equation before choosing a method.

2. Can I use a calculator to solve a differential equation?

While some simple differential equations can be solved using a calculator, more complex equations typically require manual methods. Additionally, using a calculator may not provide a complete solution, as it may only give an approximation.

3. What is the purpose of solving differential equations?

Differential equations are used to model a wide range of phenomena in science and engineering. They can help us understand how systems change over time and make predictions about their behavior.

4. How do I check if my solution to a differential equation is correct?

You can check the correctness of your solution by plugging it back into the original equation and verifying that it satisfies the equation. Additionally, you can use numerical methods to approximate the solution and compare it to your calculated solution.

5. Are there any tips for solving differential equations more efficiently?

Some tips for solving differential equations more efficiently include practicing and becoming familiar with the different methods, breaking the problem down into smaller steps, and double-checking your work. It can also be helpful to seek guidance from a tutor or teacher if you are struggling with a particular problem.