Step 1 :Differentiate both sides of the equation with respect to x. This will involve using the chain rule on the left side of the equation, as y is a function of x.
Step 2 :After differentiating, solve for y', which is the derivative of y with respect to x.
Step 3 :Substitute the given point into the equation to find the value of y' at that point.
Step 4 :The derivative of the function at the point (-1,1) is 4.
Step 5 :Final Answer: \(\boxed{4}\)