First I am sorry if this quesiton is futile, or even stupid but I find it confusing, and I would like to clarify in my mind.

Taking the derivative ##y=x^2## with respect to x by using limit is very easy stuff. But would you please illustrate how to apply this to the equation ##y^2=x^2##

It seems there is no plate anymore. For an attempt I can just apply it to the simple equation ##y=x^2##.

##(x+h)^2-x^2/h## as ##h## goes to zero. ##(x^2+2xh+h^2 - x^2)/h## as ##h## goes to zero. The two ##x^2## cancels each other. ## (2xh+h^2)/h## as ## h## goes to zero. Cancelling ##h## on the denominatior and numerator, ##2x##.

Thank you.

Taking the derivative ##y=x^2## with respect to x by using limit is very easy stuff. But would you please illustrate how to apply this to the equation ##y^2=x^2##

It seems there is no plate anymore. For an attempt I can just apply it to the simple equation ##y=x^2##.

##(x+h)^2-x^2/h## as ##h## goes to zero. ##(x^2+2xh+h^2 - x^2)/h## as ##h## goes to zero. The two ##x^2## cancels each other. ## (2xh+h^2)/h## as ## h## goes to zero. Cancelling ##h## on the denominatior and numerator, ##2x##.

Thank you.

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