# Solving Separable Equations in Differential Equations

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## Study Notes

• The video discusses the concept of separable equations in the context of solving differential equations.
• An equilibrium point or stationary point is a constant solution to a differential equation, which holds for all X in the given domain.
• Separable equations are a type of differential equation where the function F(X,Y) is a product of a function of X and a function of Y.
• Separable equations can be written as y' = P(X)Q(Y), where P(X) and Q(Y) are continuous functions.
• To solve a separable equation, divide both sides by Q(Y) to get y' = P(X)/Q(Y).
• Integrating both sides and assuming u = Y, the general solution can be written in implicit form as ∫1/Q(Y)dY + C = ∫P(X)dX.
• Singular points are points where a differential equation is not separable and require separate discussion.
• Given the equation 2xy - 1 dX + x^2 - 1 dy = z, the formal solution is ln(x^2 - 1)(y - 1) = C, with the restriction that X is not equal to +/-1 and y is not equal to 1.
• The video provides an example of finding the general solution for the equation 1 + e^(-y) dX - e^(-2y) sin(Q(x)) dy = 0, with the initial value y = Pi/2 = 0.
• The equation has infinite constant solutions, and the solution for x = n (an integer) is not valid if n is not in the domain of sin(cx)^3.
• The video invites the audience for further exercise in continuing the solution for the example problem.
• The video concludes by encouraging questions and subscribing for more videos.

Learn to solve separable equations and understand concepts like equilibrium points, singular points, and general solutions in the context of differential equations. The video provides examples and encourages further practice.

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