The solution of the equation (1-x2)dy+xydx=xy2dx isa)(y-1)2(1-x2)=0b)(...
Solution:
Given equation: (1-x^2)dy - xydx = xy^2dx
To solve this equation, we can use the method of exact differential equations.
Step 1: Check for Exactness
To check if the equation is exact, we need to verify if the following condition is satisfied:
∂M/∂y = ∂N/∂x
Where M and N are the coefficients of dy and dx respectively.
In this case, M = (1-x^2) and N = -xy^2
Taking the partial derivatives, we have:
∂M/∂y = 0
∂N/∂x = -y^2
Since ∂M/∂y is not equal to ∂N/∂x, the equation is not exact.
Step 2: Multiply by an Integrating Factor
To make the equation exact, we can multiply both sides by an integrating factor, which is an expression involving only x or y.
In this case, we can choose the integrating factor as μ = 1/(xy^3). Multiplying both sides of the equation by μ, we get:
μ(1-x^2)dy - μxydx = μxy^2dx
Simplifying, we have:
(1-x^2)/y^3 dy - x/y^2 dx = xdx
Step 3: Check for Exactness Again
Now, let's check if the equation is exact after multiplying by the integrating factor.
∂M/∂y = (1-x^2)/y^3
∂N/∂x = -x/y^2
Taking the partial derivatives, we have:
∂M/∂y = (1-x^2)/y^3
∂N/∂x = -x/y^2
Since ∂M/∂y is equal to ∂N/∂x, the equation is now exact.
Step 4: Find the General Solution
To find the general solution, we integrate each term with respect to its variable.
Integrating (1-x^2)/y^3 dy, we get:
∫ (1-x^2)/y^3 dy = ∫ xdx
Simplifying and integrating, we have:
-1/(2y^2) + (x^2/2y^2) = (x^2/2) + C
Where C is the constant of integration.
Step 5: Simplify the Solution
To simplify the solution, we can multiply both sides of the equation by 2y^2:
-1 + x^2 = y^2(x^2 + C)
Rearranging the terms, we have:
x^2 + C = (y^2 - 1)(x^2)
Expanding the right side of the equation, we get:
x^2 + C = x^2y^2 - y^2
Finally, rearranging the terms, we have:
(x^2 + C) - x^2y^2 + y^2 = 0
(x^2 - x^2y^2 + y^2) + C = 0
(x^2(1 - y^2) + y^2) + C = 0
(x^2(1 - y
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