📘 differential equations

1. **State the problem:** Given the function $y = Ae^{-3x} + Be^{x} + Ce^{-x}$, we want to find a differential equation for which this is the general solution. 2. **Recall the form

1. **Problem statement:** Find the general solution to the differential equation $$y'' - \frac{1}{x} y' + 4x^2 y = 0$$ given one solution $$y_1 = \cos x^2$$ using reduction of orde

1. **Problem statement:** Find the general solution of the differential equation $$\frac{dy}{dx} = e^{x - y}$$ by separating variables. 2. **Step 1: Write the equation and separate

1. The problem involves understanding and solving various types of differential equations including exact differential equations, linear differential equations, and growth/decay pr

1. The problem involves solving the system of differential equations: $$Dx - 4y = 1$$

1. **State the problem:** Solve the system of differential equations: $$\frac{d}{dt}x - 4y = 1$$

1. **Problem Statement:** Given the differential equation $ay'' + by' + cy = xe^x$ with the condition $b^2 - 4ac < 0$, find the correct form of the particular solution $y_p$ using

1. **State the problem:** Solve the differential equation $$y'' + y' + y = x + 1$$. 2. **Identify the type of equation:** This is a non-homogeneous linear second-order differential

1. **State the problem:** Solve the ordinary differential equation (ODE) $$\frac{dy}{dx} = 3x^2 y$$ using analytical methods. 2. **Identify the type of ODE:** This is a first-order

1. **Problem Statement:** Solve the differential equation $$y'' - 4y = (x^2 - 3) \sin 2x$$ using the method of undetermined coefficients. 2. **General Approach:** The equation is l

1. **State the problem:** Solve the differential equation $$x^2 y'' + 4x y' + 2y = e^x$$ using the method of variation of parameters. 2. **Identify the homogeneous equation:** $$x^

1. **Problem 2: Population Growth** The population grows at a rate proportional to its current population. Initial population $P(0) = 10000$ at year 2020, and $P(5) = 15000$ at yea

1. **Problem Statement:** A homicide victim's body temperature follows Newton's Law of Cooling: $$\frac{dT}{dt} = -k(T - T_s)$$ where $T_s = 20^\circ C$ is the ambient temperature.

1. The problem is to solve a second-order ordinary differential equation (ODE). 2. A common form of a second-order ODE is $$a\frac{d^2y}{dx^2} + b\frac{dy}{dx} + cy = f(x)$$ where

1. **Problem statement:** Solve the differential equation $$\left(\frac{1}{3} y + y^3 + \frac{1}{2} x^2\right) dx + \frac{1}{4} (x + xy^2) dy = 0.$$\n\n2. **Rewrite the equation:**

1. **Stating the problem:** Solve the differential equation $$xy^2y' + y^3 = x \cos x$$ for $y$ as a function of $x$. 2. **Rewrite the equation:** The given equation is $$xy^2 \fra

1. **State the problem:** Solve the differential equation $$xy^2y' + y^3 = x \cos x$$ for $y(x)$. 2. **Rewrite the equation:** The given equation is $$xy^2 \frac{dy}{dx} + y^3 = x

1. مسئله: حل معادله دیفرانسیل $$x^r y'' - rxy' + ry = x^{-r}$$ است. 2. فرمول‌ها و قواعد: این معادله از نوع معادلات دیفرانسیل مرتبه دوم با ضرایب متغیر است. ابتدا باید معادله همگن مت

1. **Problem Statement:** Solve the initial value problem (IVP) given by the differential equation

1. **State the problem:** Solve the differential equation $$\frac{dy}{dx} = -y - \sin x$$. 2. **Identify the type of equation:** This is a first-order linear ordinary differential

1. مسئله: یافتن جواب خصوصی معادله دیفرانسیل $$D(D^2+9)(D^2-8D+25)^2 y = x + x^2 \sin^3 x + x^2 e^{-8x} \cos 3x$$