Math Problem Statement

1x2\differentialDyydx=0\sqrt{1-x^2}\differentialD y-\text{ydx}=0

Solution

The given differential equation is:

1x2dyydx=0\sqrt{1-x^2} \, dy - y \, dx = 0

This can be rewritten as:

1x2dy=ydx\sqrt{1 - x^2} \, dy = y \, dx

To solve this differential equation, we can first rewrite it in a separable form:

dyy=dx1x2\frac{dy}{y} = \frac{dx}{\sqrt{1 - x^2}}

Now, integrate both sides:

1ydy=11x2dx\int \frac{1}{y} \, dy = \int \frac{1}{\sqrt{1 - x^2}} \, dx

Left-hand side:

1ydy=lny\int \frac{1}{y} \, dy = \ln |y|

Right-hand side:

The integral of 11x2\frac{1}{\sqrt{1 - x^2}} is the inverse sine function, so: 11x2dx=arcsin(x)\int \frac{1}{\sqrt{1 - x^2}} \, dx = \arcsin(x)

Now, combining both integrals:

lny=arcsin(x)+C\ln |y| = \arcsin(x) + C

Exponentiate both sides to solve for yy:

y=earcsin(x)+C=eCearcsin(x)|y| = e^{\arcsin(x) + C} = e^C e^{\arcsin(x)}

Let A=eCA = e^C, a constant. So, we have:

y=Aearcsin(x)y = A e^{\arcsin(x)}

Thus, the general solution to the differential equation is:

y=Aearcsin(x)y = A e^{\arcsin(x)}


Would you like more details on any step or have any further questions?

Here are five related questions for further exploration:

  1. How do we find the particular solution if an initial condition is provided?
  2. Can we use a different method to solve this differential equation, such as an exact method?
  3. What is the domain of the solution y=Aearcsin(x)y = A e^{\arcsin(x)}?
  4. How does the inverse sine function behave near its critical points?
  5. How would we solve if the equation were slightly different, such as 1x2dy+ydx=0\sqrt{1 - x^2} dy + y dx = 0?

Tip: Remember, inverse trigonometric functions often arise in differential equations involving square roots of quadratic expressions.

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Math Problem Analysis

Mathematical Concepts

Differential Equations
Separation of Variables
Trigonometric Functions
Exponential Functions

Formulas

\( \frac{dy}{y} = \frac{dx}{\sqrt{1 - x^2}} \)
\( \int \frac{1}{y} dy = \ln |y| \)
\( \int \frac{1}{\sqrt{1 - x^2}} dx = \arcsin(x) \)
\( y = A e^{\arcsin(x)} \)

Theorems

Inverse Trigonometric Integrals
Separable Differential Equations

Suitable Grade Level

Undergraduate Level (Calculus II or Differential Equations Course)