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I have a question regarding usage of solution given by NDSolve function

Suppose We have solved one ODE with NDSolve, it will give the solution
as interpolating function. Suppose I am solving a ODE for solution of y
as a function of x, I will get solution like
{y -> InterpolatingFunction[{{0., 1.}}, <>]}.

Now I can get the values of y at any x using y[x]/.sol/.x->0.5

But Suppose I want to evaluate the y' [x](Derivative of y) how can we
get it that from the solution of NDSolve 

Thank you

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