Integrating a Tricky Differential Equation with a Square Root Fraction

In summary, a simple differential equation is a mathematical equation that relates a function to its derivatives. There are three main types: ordinary, partial, and stochastic. Solving a simple differential equation helps us understand and predict real-world phenomena, and can be done through various techniques such as separation of variables and substitution. Real-world examples include Newton's law of cooling, the logistic growth model, the heat equation, and the Black-Scholes equation.
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PhysicsLad
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Homework Statement


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Solve the differential equation

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Homework Equations

The Attempt at a Solution


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I just can't integrate that (1+y)^(1/2)/(1+y^2)dy at the end... the other two integrals are trivial.
 

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  • #2
Try the substitution ##u=\sqrt{1+y}## and see where that gets you.
 
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I actually tried before posting. Once you make the substitution there are two ways to attempt the problem, one by doing u^2 = 1+y and then differentiating, and the other got me to 2*(1+y)^(1/2)du = dy. None of these seemed to make the integral any easier.
 

1. What is a simple differential equation?

A simple differential equation is a mathematical equation that describes the relationship between a function and its derivatives. It typically involves only one independent variable and one or more derivatives of the dependent variable.

2. What are the different types of simple differential equations?

The three main types of simple differential equations are:

  1. Ordinary differential equations (ODEs), which involve only one independent variable.
  2. Partial differential equations (PDEs), which involve multiple independent variables.
  3. Stochastic differential equations (SDEs), which involve random variables or processes.

3. What is the purpose of solving a simple differential equation?

Solving a simple differential equation allows us to find the function that satisfies the equation, which in turn helps us understand and predict the behavior of real-world phenomena. It also has various applications in fields such as physics, engineering, and economics.

4. How is a simple differential equation solved?

The exact method for solving a simple differential equation depends on its type and complexity. In general, it involves finding an analytic solution, which is a formula that directly expresses the dependent variable in terms of the independent variable. This can be done through various techniques such as separation of variables, integrating factors, and substitution.

5. What are some real-world examples of simple differential equations?

Some real-world examples of simple differential equations include:

  • Newton's law of cooling, which describes the rate at which an object cools down in a given environment.
  • The logistic growth model, which describes the growth of a population over time.
  • The heat equation, which describes the flow of heat in a given medium.
  • The Black-Scholes equation, which is used in finance to model the price of a stock option.

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