Verify a function is a solution.

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The discussion focuses on verifying that the function \( x^2 + y^2 = cy \) is a solution to the differential equation \( \frac{dy}{dx} = \frac{2xy}{x^2 - y^2} \), where \( c \) is a constant. A key strategy mentioned is to eliminate the constant \( c \) by solving for it and then taking the derivative of the function. The goal is to substitute both the function and its derivative into the differential equation to demonstrate that they satisfy the equation, confirming the solution.

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Verify that x^2 + y^2 = cy is a solution of dy/dx = (2xy)/(x^2-y^2) where c is a constant.

I don't know how i should start this problem. I've done a couple DE questions but nothing like this.. Thanks
 
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One trick I learned (from Jester) when doing these problems is to eliminate the constant $c$, whenever possible, for first-order. To do that, simply solve for the constant and then take the necessary derivative. Your goal here is to plug the function and its derivative into the DE and show that you get equality.
 

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