simply my friend

first things first, u need to separate the variables and make this eq in terms of y

now take the derivative of both sides

the RHS is a bit tricky, its a chain rule problem.

its turns out to be

plug in x = 1 and you should have your answer!

gah i hate this LATEX stuff... im trying to make this look right

dy = (1/2)*2(2x^2-x)^1/2 * (4x-1)