The notation $(f \circ g)(x)$, or $(f \circ g)(x)$, refers to the composition of two functions $f$ and $g$. The composition of $f$ and $g$ is written as $f(g(x))$, meaning that you first apply $g$ to $x$, and then apply $f$ to the result of $g(x)$.

If you are asking about the composition $(f \circ g)(x)$, here’s the general process:

1. Evaluate $g(x)$: Plug the value of $x$ into the function $g$.
2. Apply $f$ to $g(x)$: Take the result from $g(x)$ and substitute it into the function $f$.

So, $(f \circ g)(x) = f(g(x))$.

Would you like an example with specific functions for more clarity? Or do you need a breakdown of how to calculate it?

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Here are some related questions that expand on this topic:

1. How do you find the domain of a composition of functions?
2. What is the inverse of a function composition?
3. How do you handle compositions of three or more functions?
4. How do compositions behave with trigonometric functions?
5. How can function composition be used in calculus (e.g., in chain rule)?

Tip: Make sure that the range of the inner function $g(x)$ is within the domain of the outer function $f$ when composing functions.