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Ch. 9 - First-Order Differential Equations
Hass - Thomas' Calculus 15th Edition
Hass15th EditionThomas' CalculusISBN: 9780137616077당신이 사용하는 게 아니라요?교과서 변경
9장, 문제 9.PE.6

In Exercises 1–22, solve the differential equation.


y' = xeˣ⁻ʸ csc y

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1
Rewrite the given differential equation \(y' = xe^{x - y} \csc y\) as \(\frac{dy}{dx} = xe^{x - y} \csc y\) to clearly identify the derivative form.
Express the right side to separate variables involving \(y\) and \(x\). Notice that \(e^{x - y} = e^x \cdot e^{-y}\), so rewrite the equation as \(\frac{dy}{dx} = x e^x e^{-y} \csc y\).
Rewrite \(\csc y\) as \(\frac{1}{\sin y}\) and combine it with \(e^{-y}\) to get \(e^{-y} \csc y = \frac{e^{-y}}{\sin y}\). Then, rearrange the equation to isolate \(dy\) and \(dx\) terms: \(\sin y e^y dy = x e^x dx\).
Separate variables by multiplying both sides appropriately to get \(\sin y e^y dy = x e^x dx\), which allows integration on both sides with respect to their own variables.
Integrate both sides: compute \(\int \sin y e^y dy\) on the left and \(\int x e^x dx\) on the right. After integration, include the constant of integration and express the implicit solution.

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주요 개념

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

Separable Differential Equations

A separable differential equation can be written as a product of a function of x and a function of y, allowing variables to be separated on opposite sides of the equation. This enables integration with respect to each variable independently to find the solution.
추천 영상:
06:06
Solving Separable Differential Equations

Integration Techniques

Solving separable equations requires integrating functions of x and y separately. Familiarity with integrating exponential functions, trigonometric functions like cosecant, and their combinations is essential to find the implicit or explicit solution.
추천 영상:
06:18
Integration by Parts for Definite Integrals

Implicit vs. Explicit Solutions

After integration, solutions may be implicit (involving both x and y) or explicit (solved for y). Understanding how to interpret and manipulate implicit solutions is important, especially when the equation involves transcendental functions like csc(y).
추천 영상:
05:14
Finding The Implicit Derivative