Let's try to take the limit as x approaches 0 of f prime of x over g prime of x, over their derivatives. That's going to be the limit as x approaches 0 of cosine of x over 1. I wrote that 1 a little strange. Over 1. This is pretty straightforward. What is this going to be? As x approaches 0 of cosine of x, that's going to be equal to 1.