Use Euler’s method with dx = 1/3 to estimate y(2) if y′ = x sin y and y(0) = 1. What is the exact value of y(2)?

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Identify the differential equation and initial condition: \(\frac{dy}{dx} = x \sin y\) with \(y(0) = 1\).

Set the step size \(\Delta x = \frac{1}{3}\) and determine the number of steps needed to reach \(x = 2\). Since \(2 \div \frac{1}{3} = 6\), you will perform 6 steps.

Apply Euler's method iteratively using the formula: \(y_{n+1} = y_n + \Delta x \cdot f(x_n, y_n)\), where \(f(x, y) = x \sin y\). Start with \(x_0 = 0\) and \(y_0 = 1\).

For each step, calculate \(y_{n+1}\) by plugging in the current values of \(x_n\) and \(y_n\) into the derivative function, then update \(x_{n+1} = x_n + \Delta x\).

To find the exact value of \(y(2)\), solve the differential equation analytically by separating variables or using an appropriate method, then apply the initial condition to find the constant of integration.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Euler's Method

Euler's method is a numerical technique to approximate solutions of first-order differential equations. It uses a step size (dx) to incrementally estimate the value of the function by moving along the slope given by the derivative. This method is especially useful when an exact solution is difficult to find.

Solving Initial Value Problems

An initial value problem specifies the value of the unknown function at a starting point, allowing the differential equation to be solved uniquely. Here, y(0) = 1 provides the initial condition needed to apply Euler's method and to find the exact solution.

Exact Solution of Differential Equations

The exact solution involves finding an explicit formula for y in terms of x that satisfies the differential equation and initial condition. This often requires techniques like separation of variables or integrating factors, enabling comparison with numerical approximations.