∂f/∂x = lim(h → 0) [f(x + h, y) - f(x, y)]/h, if exists, is called the partial derivative of f with respect to _____?

∂f/∂x = lim(h → 0) [f(x + h, y) - f(x, y)]/h, if exists, is called the partial derivative of f with respect to _____?

Explanation

The formula ∂f/∂x = lim(h → 0) [f(x + h, y) - f(x, y)]/h represents the partial derivative of f with respect to x, and it's evaluated at the point (x, y).

The answer is x at (x, y).