And then when you're actually applying the chain rule, derivative of the outside with respect to the inside, so the derivative of natural log of x is one over x, so that applied when the input is g of x is one over sine of x, and then multiply that times the derivative of the inner function. So don't forget to do this right over here. Now another misconception that students have is instead of doing what we just did, instead of applying the chain rule like this, they take the derivative of the outer function with respect to the derivative of the inner function. So for example, they would compute this, f prime of g prime of x. f prime of g prime of x. Which in this case, f prime of x is one over x, but if the input is g prime of x, g prime of x is cosine of x. So many students end up doing this, where they take the derivative of the outside and they apply, and the input into that, they use the derivative of the inside function. This, this is not right.