Denote that expression is differentiated, without differentiating it

Question

I'm trying to indicate that I'm working with the derivative of an expression, without differentiating it. This is how it would be done, if I differentiate both sides now: \begin{align} y &= 5x^2\\ y' &= 10x \end{align} However, I want to differentiate the right side later, but keep working with the expression. How can I denote that I'm referring to the derivative? I suppose this won't work, but I would like to do something in this fashion: $$ y = 5x^2\\ y'= (5x^2)' $$ Is there any good way to do this?

Answer 1

You could write: $$\frac{d}{dx} 5x^2$$ This is very clear.