Simple Separable Differential Equation

In summary, the problem is to find the derivative of y' = y^2sinx and the solution involves using integration to find the value of y. The final answer is y = 1/(cosx + C).
  • #1
BarackObama
13
0

Homework Statement


y' = y^2sinx


Homework Equations





The Attempt at a Solution


dy/dx = y^2sinx
dy/y^2 = dxsinx
integral(dy/y^2) = integral(sinxdx)

Aside:
let u = y^2
du = 2ydy
dy = du/2y

ln(abs(y^2))/2y = -cosx+C

integral(du/2y^3) = integral(sinxdx)
 
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  • #2
Good morning, Mr President! :smile:
BarackObama said:
Aside:
let u = y^2
du = 2ydy
dy = du/2y

ln(abs(y^2))/2y = -cosx+C

integral(du/2y^3) = integral(sinxdx)

hmm … you're not going to get a second term like that. :redface:

You need the integral of 1/y2

surely you know what that is anyway?? :smile:
 
  • #3
Thanks!

y= 1/(cosx + C)
 
  • #4
Yup! :biggrin:
 

FAQ: Simple Separable Differential Equation

1. What is a simple separable differential equation?

A simple separable differential equation is a type of differential equation where the dependent variable and its derivative are separated on opposite sides of the equation. This allows for the equation to be solved by integrating both sides separately.

2. How do you solve a simple separable differential equation?

To solve a simple separable differential equation, you must first separate the dependent variable and its derivative on opposite sides of the equation. Then, integrate both sides separately and add a constant of integration. Finally, solve for the dependent variable to get the solution to the equation.

3. What are some real-world applications of simple separable differential equations?

Simple separable differential equations are commonly used in physics, chemistry, and engineering to model various natural phenomena. For example, they can be used to describe the rate of change of a chemical reaction, the growth of a population, or the motion of a pendulum.

4. Are there any limitations to using simple separable differential equations?

One limitation of using simple separable differential equations is that they can only be applied to equations where the dependent variable and its derivative can be separated. Additionally, they may not accurately model complex systems with multiple variables and non-linear relationships.

5. Can you provide an example of a simple separable differential equation?

One example of a simple separable differential equation is y' = ky, where y is the dependent variable, k is a constant, and y' is the derivative of y. This equation can be solved by separating the variables and integrating both sides to get ln(y) = kt + C, where C is the constant of integration. Solving for y gives the solution y = Cekt.

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